The cartridge stop latch does the same thing front to back, super Vincis are Crio+.
So far the gun feels great, light, shoulders great. And i don't know if this Is for all SV but its a PITA to assemble and disassemble new. Once you break it in should be much smoother. Factory choke tubes are the same length as my Nova Extended choke tubes. They are flush though.
But if you have the money, I would buy the Super Vinci.
Counting the days til next duck season.