You should be allright. I have seen them with different sized stock on the edges though. Sometimes cutting too much will show a tenon and mortise joint. Remove the door knob and latch to see how thick it is on that side and check the screw holes on the hinge side. Also if not prehung or predrilled yet, then just get an 1/16" inch bit or so and drill a small hole around a hinge or knob area. Measure the depth you drill through for the thickness.