^The point is, canonically it's supposed to be the same continuity prior to 2233. However, different tie-ins, since they are not canonical, have frequently presented contradictory interpretations of events that supposedly took place in the same original timeline. That's all they are -- interpretations. The comic and the novel don't represent different 20th-century histories, they represent different authors' speculations about what Trek's 20th century may have been like.
Or the JJverse is just an another mirror universe.