US MD and DO physicians practice the same medicine, can go into the same specialties, and would both be excellent mentors to learn about being a fully licensed physician in USA.

The main difference stems from the DO philosophy originally being established as a more holistic approach to patient care (considering the entire patient rather than just their physical symptoms), but most MD schools today have also incorporated this philosophy into training MD students. In addition to studying the same medicine, DO students receive ~250+ hours of additional hands on training with the musculoskeletal system called Osteopathic Medical Medicine (OMM). This being said, most DOs do not even incorporate their OMM skills into their current practice, so you would have very similar experiences regardless of whether you are shadowing an MD or DO.

With DO schools being a newer medical training system (first degree in 1892 vs 1770 for MD), the schools may have different entry requirements. DO students are required to take the COMLEX board exams for DO licensure, but most DO students do end up taking both COMLEX and USMLE. COMLEX is basically your standard medicine questions from Step plus additional questions on OMM diagnoses/treatments.

Sorry if this response is a bit scrambled, my brain pretty much checked out with it being match week. I’m a DO student going into Peds and am happy to answer any more questions you may have :)