No difference. I tPA, send pts to embolectomy, botox migrainers, co-manage NCCU pts, and manage everything no differently than my colleagues. Perhaps I had more familiarity of NMSK anatomy at the beginning of my residency but all of that can be self-taught. We all take the same boards by ABPN if you go to a ACGME Neuro residency.
The thing about OMT is if you don't practice it, you'll forget it like any other procedure. Only time I use OMT is when my wife has migraines =)
Where is I see a big difference in practice style is not degree, but where people did their residencies/fellowship along with their personalities. Of course we all strive to practice evidence-based medicine but some are more aggressive vs conservative for diagnostic/treatment but this is true for most of medicine.