broad breasted white turkeys are different sizes?

[groomergirl911]

I have two turkey poults that are about a month old. Wheni got them they were exactly the same but in the past month one as as become double the size of the other! It's huge! I'm wondering I'd that's a sign of it being a boy ior if the little one for some reason isn't eating enough? The little one eats like a hog when there a meal worms but I don't see him or the big eating a lot.