The AEMT as of right now is only recognized in a handful of counties in CA.
I know on the southern end, San Diego County recognizes AEMT and I want to say that San Bernardino does as well, but I don't recall. Either way, both of these counties have yet to train any AEMTs. I think the educational aspect is still getting worked out, not to mention there isn't much of a need for AEMTs in San Diego County. The majority of counties in CA don't recognize AEMT at all. So if you get you're AEMT in San Diego and move to Orange County, your AEMT would not be recognized, you'd only qualify as an EMT.
Personally, it makes for a confusing mess. The state should forgo the whole LEMSA (Local EMS Agency) "Build-Your-Own-System" system and mandate either a two tier system state-wide (EMT/Medic) or a three tier system (EMT/AEMT/Medic) state-wide. A little consistency from county to county would be nice, but then again...that just makes too much sense.
Long story short:
California STATE has implemented the AEMT, but it is up to each LEMSA/County to decided whether or not to recognize/implement it or not. Most do not.
PS.
The CCT Medic stuff is true, but there are others on this forum who are much more informed about that change than myself.