That that a Baptist or other evangelical would not understand, but, the theology is different between Baptist and Presbyterian.
For example, a Presbyterian is not going to have the same aversion to infant baptism that a Baptist will have. Same goes for baptism via pouring instead of immersion.
The difference between Presbyterian Sacraments and Baptist ordinances is significant.
Could go on and on, but, the theology of a Southern Baptist and the theology of a Presbyterian are going to be very different.