If you just switched to controller then perhaps it might be considered legal. However in reality you mean changing all the motors from 393’s to V5 smart motors too so that’s really a complete subsystem 2 change and thus illegal. Why would you even consider doing this?
During a single competition event - swapping in V5 Robot Brain, V5 Battery, and V5 motors on drive train you have violated <R1> by swapping out entirety of subsystem 2.
Hmmm… So if I had V4, after a competition I could switch to V5 and hand the robot to another team for a competition that they would compete in. After the competition they would then switch back to V4 to hand it to another team, and then that team would switch to V5 and hand it to an additional team.
Absolutely not. Plate switching is explicitly prohibited. In this scenario you say “hand the robot to another team” and that is the infraction of the rules. See <R1> Note C.