Either Paul and Peter (as implied by the word TO -were teaching the SAME Gospel but to different audiences. OR Paul & Peter were teaching DIFFERENT Gospels to different audiences as indicated by OF Peter - the Gospel OF the circumcision Paul - the Gospel OF the UNcircumcision. .. If they were teaching the SAME Gospel then what is the need to change the translation from OF to TO ? Greek shows original was OF https://www.scripture4all.org/OnlineInterlinear/NTpdf/gal2.pdf