I’m going to hijack this for my rewrite of the film :p
Basically the two major differences is Celtic interiors grids kill on Chopper (just the killing blow). The fight plays out the same except at the end instead of grid killing celtic, he runs away, reason being they literally just just got into several fights on the floor like that so it’s pretty much a net zero and so he just runs off.
So you have Chopper trying to survive, showing off how intelligent preds can be (he always came across as a smart one to me)
You have Celtic hunting down Grid, even refusing to use other slain Xeno’s as his trophy kill, showing how dedicated he is to hunting grid.
Then you have Scar with the same plot line as before
Of course I’d make Alexa a lot less pushy (God why was she so pushy)
And Celtic and Chopper wouldn’t get their plasma casters as everyone who has one besides Alexa is killed by Aliens.
Celtic and Chopper make it out of a pyramid a different way than Scar did
Instead of Scar making Alexa apart of a tribe it’s the ancient Predator and its after a proper alien queen kill, not what they did (the queen kill wasn’t bad but it’d make it’d help make it more believable)
At some point Grid and and Celtic have a rematch and at least one of the Predators helps out with the alien queen and at least one survives.
Of course any inconsistent issues (like Celtic and Chopper finding a different way out) would have the story rewritten around it