There’s a good mixture. Some of the games I listed were literally just ports to he new hardware. Some were complete remakes. I’d say most of Skyrim lies somewhere in-between. It’s the base game, plus the 3 DLC’s, plus however many officially-sanctioned mods or platform-specific changes like for VR, Alexa (lol), or Switch. The re-release and different edition names are trying to set up boundaries and market the amorphous blob that most mod-heavy PC games are to console users.