We have ONE LINE. Which is almost certainly being taken out of context.
Sequel theory makes even less sense now. We have present and future. We dont need an alternate universe.
Though i sincerely hope all the 14 year timeskip isnt a Ep 26-esque 'possible future'.
If this Eva Curse where you stay 14 years old/young forever if you're the pilot is true, and time isn't linear, then I'm pretty sure you can bullshit your way into time looping around so many times that it has differentiated from what it was in NGE.
Think of NGE as timeline 1 and think of Rebuild as timeline 14,506. Though again, this is just bullshitting not what I actually believe, though there's totally a way to make a sequel theory possible.