Nice. They are marked the same from breeder. So are they also same clutch? Wondering why the one is so much smaller. If they are all same age, clutch, you might want to keep a close eye on the smaller one that it's getting to eat and not being bullied away.
Nice looking torts though.
I agree with @wellington, if they are the same age there is something that might be amiss. If I were you, I would monitor their behavior, and make sure everything is okay socially. There could be other things at play, such as a high parasite load or other infection. A fecal sample is about $50 if you don't have the equipment.
Did you roll the dice and get all males or do you just like the three stooges cast? I have three girls I call the powerpuff girls