how can you tell? (I believe you) is it the areola shape, or something more obvious? I can't see enough hair to use that.
Hitomi's right breast is, if you look closely, significantly larger than her left. Not unusual since real breasts are not symmetrical. Lucie's are different sized but not as pronounced. Hitomi's breasts are also larger and they are slushier. Having just met her at the AVN here in Sin City last month I can certify that her breasts are truly heavenly to the touch.

So, I'm 99% certain that is Hitomi.