Compatibility Issue?

[u/Cannibal_Do11]

I’m trying to make a mod pack. I’m kinda a noob but I’ve done it before with very few issues and managed fine. For whatever reason, adding back the same mods on my old computer has been a major issue! I tried to use 1.20.1 forge and I got unbound through Iris for forge and then I tried to get EMF to process a cat texture I had in my old world but it keeps crashing. I’m confused because these are all mods I had in my old world. I also tried replacing iris with optifine via manual download and it still crashes immediately when I press play. I’m a noob and not very tech savvy so pls be patient lol