I would call the hatcher-----they should have not mixed them in my opinion. I have hatched a lot of both, I just never let them get mixed before selling them, BUT they were not a breed I knew a lot about. Maybe someone else has a sure fire way to tell besides their feet?? Good Luck
LOL, Them is hard for me to tell apart. The bottom of the giants feet should be yellow. That should help. Seemed to work better when they were older. Call the hatcher---they can probably help if the yellow feet does not help you.