If they are reanimations, they would be ones created by Tobi himself. The man has a sharingan so copying the reanimation should be a breeze if Kabuto showed him it once. He would be incredibly foolish to trust Kabuto's zombies with the bijuu, that's for sure. In any case they seem to possess the powers of the original jinchuuriki (the bodies), which would suggest reanimation zombies. Didn't Pain's rod undead have static powers given by Pain, nothing related to the bodies?