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I’m not entierely sure from the angle of the photo to be honest but male Chinese hams have really obvious testicles if you view them from above or behind you really can’t miss them, I’ve had several Chinese of both sexes & there really is no way to confuse them so I’m sorry to be able to quite decide from your photo!
Either way Chinese hams are solitary & should be kept separately, once they fall out fights can become extremely aggressive resulting in severe injuries or worse so I would separate them immediately, in case Snowy is pregnant I would remove Sushi to the new cage so there is less stress & disruption for Snowy.
Give Snowy lots of substrate & shredded tissue so if she is pregnant then she can build a large nest out of sight, it is very important not to disturb them at all during & after pregnancy. until the babies begin to come out on their own, no peeking or cleaning, just give lots of food.

Edit I just saw your other post & if you’ve had them for 5 months then pregnancy is unlikely as Shannon said there, still important to separate them though.