slot rtp page showing different number on two crypto casinos, how that work

saw this with one of the classic fruit slot games. one crypto site is saying rtp is 96.5% and another flashes it at 94.3% in their game info. nothing else about the game itself seems different. the reels, paylines, symbols, even the paytable look identical. tried asking support but they basically copied what was already listed in the game rules, which doesn’t say much at all about why there’s two different rtp numbers. 

makes me wonder if these crypto casinos actually get different versions of the slot engine or if they just tweak stuff on their end. not a slots main myself, i usually stick to live roulette and let the wheel do the talking, but i’d like to know what i’m actually looking at if i ever wander over to the slots corner. anyone else notice this with the same games across sites? i can never tell if it’s technical or just marketing smoke. slots can be weird sometimes.