AA and JSB exact are different pellet.
I used to believe that JSB exact and AA are the same pellets under different names.
recently I have noticed that while both pellets did perform very well in most of my rifles, there was noticeable difference in Their POI.
I have cut both pellet to compare and have noticed that while they looked the same externally they are completely different pellet.
AA seems to have longer thinner skirt with short head when compared with JSB exact.
Here is a picture for both pellets in 177.