The US theatrical cut of “Yellow Submarine” has not been released in a digital format. It appears on VHS and LD only.
I think this says the Theatrical Cut was released on a German DVD.
https://www.movie-censorship.com/report.php?ID=1064
No, that is just the same version released everywhere since 1999. It matches the UK version of the film as it premiered. Upon international release, the film was shortened, with some alternate footage during the final battle. That was the widely available version of the film before the 1999 restoration released on dvd at the time.