jph,
I am a 1st year D.O. student, and I graduated from D.C. school in 94. You should be fine, I haven't seen too many differences in the basic sciences or manipulation so far(although I went to LACC, which was well known for being more difficult in the basic sciences). If you just are consistent in putting in your time, there should be no problem. By the way, to av8r, smt of chiropractic(CMT)is applied to all parts of the musculoskeletal system, it's just that chiropractic is best known for low back. The main difference I see is that OMT emphasizes more low amplitude stuff than CMT.
DCDO