There is no difference what so ever the only thing besides what you mentioned is different is iirc the pt92 has a blue bbu while the kjw m9 has a red one. Same thing just different colour. Also the original and I mean original pt92 Taurus made was an exact copy of the 92f safety location and all they only moved it down near the grips on a later production model and it just stuck.
"Don't you know the first law of physics? Anything fun costs atleast $8"