There isn't any reason the two shouldn't share Buu's ability to absorb other fighters and, specifically, to absorb alternate versions of themselves. Even if Majin Duu cannot defeat Tamagami 1 ...

Until Dragon Ball Super, Super Buu with Gohan absorbed, "Buuhan" as fans call him, was the strongest villain in the official Dragon Ball canon. It's currently unclear if Majin Kuu possesses the ...