Historic Documents

The WCF 1647 vs the Newer Translations
The Confession of Faith of the Westminster Assembly was approved by the general assembly of the Church of Scotland on August 27, 1647, and (together with the Larger and Shorter Catechisms) has served as one of the doctrinal standards, subordinate to the Word of God, for Presbyterian churches since that time. As an American Presbyterian church, the OPC descended from the Presbyterian Church, USA, and inherited revisions to the Confession made prior to 1900, some of which were ratified by the Synod of New York and Philadelphia as early as 1788. The OPC did not adopt the revisions to the Confession made by the PCUSA in 1903 (notably new chapters entitled “Of the Holy Spirit” and “Of the Love of God, and Missions,” and a “Declaratory Statement” softening the Confession’s position on election), except for omissions in chapters 22 (about refusing a lawful oath) and 25 (about the pope being the Antichrist). (For further information see the Report of the Committee on the Constitution submitted to the Second General Assembly [1936].) Aside from minor changes in spelling, the OPC has made no revisions to the text of Shorter Catechism. The Larger Catechism was adopted with the omission of the phrase “tolerating a false religion” in answer 109.
Though the American revisions to the Confession of Faith are not insignificant, yet, compared to the total length of the Confession, they are quite minor, involving 145 words out of 12,063. Below is a comparison of the two versions (differences are highlighted in italics).

 

ORIGINAL WORDING
AMERICAN REVISIONS
Chapter XX
Of Christian Liberty, and Liberty of Conscience
IV. And because the powers which God hath ordained, and the liberty which Christ hath purchased, are not intended by God to destroy, but mutually to uphold and preserve one another; they who, upon pretence of Christian liberty, shall oppose any lawful power, or the lawful exercise of it, whether it be civil or ecclesiastical, resist the ordinance of God. And, for their publishing of such opinions, or maintaining of such practices, as are contrary to the light of nature, or to the known principles of Christianity, whether concerning faith, worship, or conversation; or, to the power of godliness; or, such erroneous opinions or practices, as either in their own nature, or in the manner of publishing or maintaining them, are destructive to the external peace and order which Christ hath established in the Church, they may lawfully be called to account, and proceeded against by the censures of the Church, and by the power of the civil magistrate.
Chapter XX
Of Christian Liberty, and Liberty of Conscience
IV. And because the powers which God hath ordained, and the liberty which Christ hath purchased, are not intended by God to destroy, but mutually to uphold and preserve one another, they who, upon pretense of Christian liberty, shall oppose any lawful power, or the lawful exercise of it, whether it be civil or ecclesiastical, resist the ordinance of God. And, for their publishing of such opinions, or maintaining of such practices, as are contrary to the light of nature, or to the known principles of Christianity (whether concerning faith, worship, or conversation), or to the power of godliness; or, such erroneous opinions or practices, as either in their own nature, or in the manner of publishing or maintaining them, are destructive to the external peace and order which Christ hath established in the church, they may lawfully be called to account, and proceeded against, by the censures of the church.
Chapter XXII
Of Lawful Oaths and Vows
III. Whosoever taketh an oath ought duly to consider the weightiness of so solemn an act; and therein to avouch nothing but what he is fully persuaded is the truth. Neither may any man bind himself by oath to anything but what is good and just, and what he believeth so to be, and what he is able and resolved to perform. Yet it is a sin to refuse an oath touching anything that is good and just, being imposed by lawful authority.
Chapter XXII
Of Lawful Oaths and Vows
III. Whosoever taketh an oath ought duly to consider the weightiness of so solemn an act; and therein to avouch nothing but what he is fully persuaded is the truth. Neither may any man bind himself by oath to anything but what is good and just, and what he believeth so to be, and what he is able and resolved to perform.
Chapter XXIII
Of the Civil Magistrate
III. The civil magistrate may not assume to himself the administration of the Word and sacraments, or the power of the keys of the kingdom of heaven: yet he hath authority, and it is his duty, to take order, that unity and peace be preserved in the Church, that the truth of God be kept pure and entire; that all blasphemies and heresies be suppressed; all corruptions and abuses in worship and discipline prevented or reformed; and all the ordinances of God duly settled, administered, and observed. For the better effecting whereof, he hath power to call synods, to be present at them, and to provide that whatsoever is transacted in them be according to the mind of God.
Chapter XXIII
Of the Civil Magistrate
III. (Completely rewritten) Civil magistrates may not assume to themselves the administration of the Word and sacraments; or the power of the keys of the kingdom of heaven; or, in the least, interfere in matters of faith. Yet, as nursing fathers, it is the duty of civil magistrates to protect the church of our common Lord, without giving the preference to any denomination of Christians above the rest, in such a manner that all ecclesiastical persons whatever shall enjoy the full, free, and unquestioned liberty of discharging every part of their sacred functions, without violence or danger. And, as Jesus Christ hath appointed a regular government and discipline in his church, no law of any commonwealth should interfere with, let, or hinder, the due exercise thereof, among the voluntary members of any denomination of Christians, according to their own profession and belief. It is the duty of civil magistrates to protect the person and good name of all their people, in such an effectual manner as that no person be suffered, either upon pretense of religion or of infidelity, to offer any indignity, violence, abuse, or injury to any other person whatsoever: and to take order, that all religious and ecclesiastical assemblies be held without molestation or disturbance.
Chapter XXIV
Of Marriage and Divorce
IV. Marriage ought not to be within the degrees of consanguinity or affinity forbidden by the Word. Nor can such incestuous marriages ever be made lawful by any law of man or consent of parties, so as those persons may live together as man and wife.The man may not marry any of his wife’s kindred nearer in blood than he may of his own; nor the woman of her husband’s kindred nearer in blood than of her own.
Chapter XXIV
Of Marriage and Divorce
IV. Marriage ought not to be within the degrees of consanguinity or affinity forbidden by the Word. Nor can such incestuous marriages ever be made lawful by any law of man or consent of parties, so as those persons may live together as man and wife.
Chapter XXV
Of the Church
VI. There is no other head of the church but the Lord Jesus Christ. Nor can the pope of Rome, in any sense, be head thereof: but is that Antichrist, that man of sin, and son of perdition, that exalteth himself, in the Church, against Christ and all that is called God.
Chapter XXV
Of the Church
VI. There is no other head of the church but the Lord Jesus Christ. Nor can the pope of Rome, in any sense, be head thereof.
Chapter XXXI
Of Synods and Councils
Chapter XXXI
Of Synods and Councils
I. For the better government, and further edification of the Church, there ought to be such assemblies as are commonly called synods or councils. I. For the better government, and further edification of the church, there ought to be such assemblies as are commonly called synods or councils: and it belongeth to the overseers and other rulers of the particular churches, by virtue of their office, and the power which Christ hath given them for edification and not for destruction, to appoint such assemblies; and to convene together in them, as often as they shall judge it expedient for the good of the church.
II. As magistrates may lawfully call a synod of ministers, and other fit persons, to consult and advise with, about matters of religion; so, if magistrates be open enemies to the Church, the ministers of Christ of themselves, by virtue of their office, or they, with other fit persons, upon delegation from their Churches, may meet together in such assemblies.

~The above graphic from the OPC website: Comparison

Declaratory Statement from the PCUSA: Statement on changes

Turning Points in American Presbyterian History: Here

Additional comments: Here