I am wanting to know the difference between the cab mounts on the frames of 83 2wd f250 and a 79 f250 4x4.

Are they even close?
Would it be easyer to my the 83 2wd 4x4 than swap the cab onto the 79 4x4 frame?

The frame rails are further apart in post-1980 trucks, aside from that I don't have any other info.