User blog comment:Orion001/Earth-12041 vs Earth-TRN633/@comment-33167125-20180407065431

Possibly after the events of Avengers : Secret Wars, When the Avengers restored their earth from battleworld, but something could have went wrong with the process, so it is possible that their timeline (Earth-12041) merged with Earth-TRN633 (Marvel's Spider-Man Universe) replacing/retconning the events that happened in Ultimate Spider-Man. So you can say that Earth-12041 and Earth-TRN633 are one and the same. Besides not everything remains the same after battleworld. OR the writers just don't give a bloody fuck anymore.