No, the RPCNA uses the original Westminster, but then has alongside that its "Testimony", which explains a few things or furthers it (for example, a capella psalm singing is part of the Testimony).
There are three places I am aware of that the testimony rejects the WCF:
The last part of 24:4
"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."
And speaking of the magistrate, the last part of 23:3
"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."
And 31:2 is also rejected
"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."