I can't even guess with these guys yet...actually all of the pardalis I have look about the same.
I have not been able to verify that any sexual dimorphism exists this type of South African leopard tortoise. I have heard both ends of the argument (males grow bigger/females grow bigger) from reputable people. Others say that males and females are the same size. Maybe Tom could provide some insight since he has seen the adults that produced these. But, If there is some sort of dimorphism, and assuming these two are not related, I would assume at this point they are the same sex. They are almost exactly the same size and growing at the same rate.