We don't still know waht techniques had Mito. We know that she had a diamond on her forehead like Tsunade and now Sakura. This Byakugou's seal could be perfectly an Uzumaki Seal. But as far as we know, only Tsunade uses the Souzou Saizei when she opens her seal on forehead so... Surely, Sakura can use it but we've still no proof about that. Let's wait to see it...
I guess that there's a reason that Kishimoto gives her that seal if she still don't opened it.... We know what happens what Tsunade releases her seal (Saizou Saizei and "her" Byakugou technique). We dont know what can do Sakura with her seal yet and the same with Mito.