or could you possibly be looking at both L3 and L4 routines? for vault for example, the roll is L3, the handstand fall flat is L4.
In L3 AAU, gymnasts do handstand flatback for vault just like L4. Different programs have slightly different routines. Even within L3 AAU, there are different "types" of AAU--AAU National rules and AAU Florida rules for example. There are differences in routines for these as well. For example, AAU National rules do not do an actual mill circle on bars and the mount for bars is a pull-up and over. For AAU Florida, there is a mill circle and the mount for bars is a glide/back to pull-up and over (like USAG L4).