Trick photography. They both look like Kass to me. The one with the buff over the face ... Kass. The necklace proves that. The one without the buff is a female which leaves only Kass.
Yep — that necklace is a dead giveaway.
And that looks like her haltertop under her collared shirt.
It looks like this was a formal challenge — she got all dressed up for it. She wore her jewelry and her Sunday best for it.