There's no reason to think they're going to do everything differently. They know people are there for the nostalgia hits, we saw plenty of that being appealed to. And even though things seem to now be certain to go differently in the end, the party is more or less in the same situation as in the OG at this point - they've left Midgar and are chasing Sephiroth. I expect we're still going to all the same places to do a lot of the same things, but there will be important story beats that change.