Image cut-outs feature is an S23 exclusive feature it seems. Was with family over the weekend who have S22s and with One UI 5.1 updated they could not do cut-outs. Oh how they cried
Works on videos, GIFs, anything really lol.
Edit*
Also been looking into charge times etc, a 30 min charge at 45W on both S22 Ultra and S23 Ultra gets both phones to around 70%. Only the S23 Ultra sees a small improvement in 10mins and 20 mins charge times resulting in a few more %, but nothing to even warrant calling it a win. So no, the S23 ultra is not remarkably faster at charging, even the first 50% from empty.