Board Thread:Questions and Answers/@comment-6312663-20130302175900/@comment-11836-20161023231928

Those took place on Earth-7642 aka Earth-Crossover. The only Marvel/DC crossovers that are part of the main Marvel reality are DC vs Marvel, Avengers/JLA, Fantastic Four and Superman, Green Lantern and Silver Surfer, Silver Surfer and Superman, and anything directly related to DC vs Marvel like All Access.

Any other crossover where Marvel characters exist alongside non-Marvel comic characters from DC, Image and the like usually take place on Earth-Crossover.