Hi young aspirant,
Surely AIIMS MBBS and Harvard MBBS are not the same. Harvard is amongst the best medical colleges all over the world so there ought to be major differences in their syllabi as well as their teaching practices.
Another thing to consider is that in the United States, you must first complete a Premed degree before applying to medical school. So that'll be 4+4 years following your 12th grade. In India, you'll start med school right after high school, where you'll spend 5.5 years.
As for your second question, t he issue with the medical industry is that it is difficult to move places, let alone nations. I'm not saying you can't return to India after living in the United States, but it would be difficult. So, pick where you wish to focus your work.
Hope that helps
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