Size difference in black musk turtles

I bought two black musk turtles about 3 months ago, so they're probably around 6 months old now, I bought them from the same tank in the same shop at the same time, they both eat alot and seem perfectly fine otherwise but one is at least twice the size of the other turtle now, the smaller turtle doesn't seem to have grown much at all since we got him, I spoke to the man in the shop and he said it could just be because ones male (the smallest) and ones female he didn't seem bothered by it at all I'd just like a second opinion

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