all ps5 games are compatible, but I'm not sure about ps3/4/vita games. if you never played the games, you should be fine. I changed my name once, and I've yet to encounter any problems, even as far back as the ps3, but I had played so few games. there's really no way to tell unless you check your games. if you're like me, you're probably fine. you should be good regardless, but sony doesn't promise anything beyond the ps5 library.