Baby tortoises of the same age often grow at different rates, that's normal. How big are each of them (straight carapace length)? By "dwarf" Hermann's are you referring to Western Hermann's, Testudo hermanni hermanni? There really is no "dwarf" Hermann's species. But the Western race used to be referred to the dwarf race many years ago because it was believed to always be the smallest of the Hermann's tortoises. This is actually is not always true.