Actually there are almost no incongruences in the Star Wars books, if any at all. LucasFilm makes sure that none of the books contradict. Although there are different characters and stuff, it is still the same universe. LucasFilm actually controls the entire series of books and hires authors to write their storyline. My dad is a huge fan of Star Wars so I know these things.
I think that the same could be done for Oddworld. OWI could control the stories and make sure the books don't contradict anything.
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