I feel like the Pokemon games of the same generation would probably make more sense combined? Do any lists actually have both Red/Blue and Yellow ranked simultaneously, other than weird Pokemon specific lists? Most fans I know group them together. I also feel like the various Street Fighter games would be in the same boat; Street Fighter II, Turbo Hyper Fighting, Super Street Fighter II Turbo, Street Fighter II: Championship Edition, Super Street Fighter II are five variations of the same game, mostly just adding more characters.
Just to have it in list form:
1. Pokemon Red/Blue and Pokemon Yellow
2. Pokemon Gold/Silver and Pokemon Crystal
3? if Pokemon Emerald or Platinum are sub-2000, they could also probably be combined with Ruby/Sapphire and Diamond/Pearl. UltraSun and UltraMoon as well? Black/White 2 are the only 'third' games that truly feel distinct enough to warrant their own entry (and even those feel closer to remixes)
4. Street Fighter II/Street Fighter II Turbo: Hyper Fighting/Super Street Fighter II Turbo/Street Fighter II: Championship Edition/Super Street Fighter II
5. Street Fighter IV/Super Street Fighter IV/Super Street Fighter IV: Arcade Edition
I believe all the other Street Fighters in the top 2000 are their own distinct entities
I see you updated to combine Ninja Gaiden and Black, though I think listing it as Ninja Gaiden Black or at least having that title in parentheses might be helpful - just looking at the Microsoft store, you can only buy it in Ninja Gaiden Black form these days, and that's always how I have known the game. If nothing else, it would make it easier to differentiate from the NES game with the same title.
Other than these, I'm not sure I've noticed any. Do any other fighting game series have the same problem as Street Fighter? I think Pokemon and Street Fighter are distinctly popular enough to have gotten away with selling the same game multiple times. Just look at this nonsense:
https://en.wikipedia.org/wiki/List_of_S ... _II_series