Same cage, different cages, etc. Information is needed to help with your understanding.
To answer your question in the way it was asked, yes that can occur, as well as one dying and the other thriving.
While your hogs look great, they both appear to be a tad under metabolized. that is, not processing energy at a normal rate. So energy is deposited outside the body, as fat deposits. Where it makes those bulges.
I can say, hogs utilize heat in nature that's right up there with the hottest. The highest IBT's I have ever taken with snakes was with Kennerlyi.
I would think both have the same genetic potential, or close. In nature, there is a huge range of growth rates based on many things, from prey, to habitat choice(wrong place, wrong time)
In captivity, there should not be that problem. In captivity, its often more about individual tolerances to unnatural conditions. Some cope better then others in unnatural conditions. I hope this helps. Cheers

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