Just played around with the FCOM, the +25kts for flaps 3 seems to be a NEO only thing. A319/320 CEOs do not have that in the FCOM, there is only a restriction for A321 to use Flaps 3 and Vref +10 in that case. In any case it tells us to use the landing distance procedure which if course requires a calculation with the flysmart landing app. Did a few calculations, NEOs show the Vref +25, CEOs show +6. But of course i couldn’t check every MSN.