Hmmm...pickup-wise. Well, I haven't had the bass apart and probably won't, I mean, it's new, it's MIM, no need to verify parts and whatnot. But I suspect there are some differences in construction of the pickup. Usually the MIMs have the exposed bar magnets on the bottom. Not that I can hear any difference. To me, it sounds VERY close if not identical to nearly any P I've owned. (Lots...!). It will NOT have the raised "A" poles like the AVRI though. That's the only cosmetic (and aural) difference between the two, other than not having covers and a thumbrest. You'll love the "C" width at the nut too. One observation on mine, since I can compare it to my own '60 P, is that the MIM width is right, but it is actually slightly thicker front to back than a real "C" and an AVRI "C". Not overly so, but instantly noticeable to me. They're probably all a bit different though.