What makes you want to switch from a PA to an AA? It seems like you'll be completely dropping the money and time spent from the last 2-3 years just to do it all over again, no? As far as I know being both an AA and a PA offers very little benefit to a future career.
Anyhoo, to answer your question. AA is definitely more specified with regards to academics. They still go through A/P, Pharmacology, etc, but the large majority is airway and anesthesia related. Feel free to compare your education to something like this:
http://www.ucdenver.edu/academics/colleges/medicalschool/departments/Anesthesiology/Education/aaprogram/AA%20Information/Pages/Curriculum.aspx (And I agree, I'm younger and med school still sounds like a horrible trap)