I’m running a 9 speed sram powerlink on a 10 speed xtr chain and it works absolutely fine.
I wasted money buying a kmc 10 speed specific link for the sram chain I had previously. I then got a shimano chain and the 10 speed kmc link was a right pain to get on, ended up bunging a 9 speed link on the 10 speed shimano chain and it’s been fine ever since.