User blog comment:Notdoppler/90s Marvel Shows Reality Designations/@comment-4772145-20120124164759/@comment-927477-20120124170713

Well we initially though all five were separate but the update now states:

"Earth-92131 - X-Men cartoon (10/21/92); includes Spider-Man cartoon (11/19/94)" "Earth-534834 The Marvel Action Hour: FF cartoon (1994) - includes Marvel Action Hour: Iron Man (1994) & Incredible Hulk (9/8/96)" "Earth-400285 Incredible Hulk cartoons (1996) part of Reality-534834?" "Earth-569386 - undesignated; previously referenced The Marvel Action Hour: Iron Man cartoon (1994), which is part of Reality-534834"

The Spider-Man version of Iron Man and the one from his own show/the one in Hulk, are simply parallel versions, just like all the Spider-Men in Spider Wars are parallel versions of each other. Also, Scarlet Spider exists in Earth-534834 but doesn't in Earth-92131, which makes the idea that the two main universes are Spider-Man/X-Men and FF/Iron Man/Hulk plausible.