Are Campbells bigger than WWs?

[samincittagazze]

I have 4 hybrid hammies from Pets@Home. my 3 girls have Winter White colouring and seem to be more on that side with their looks in general. My new boy Max has a Campbell's colouring (Argente I think) and he is much, much bigger and heavier than the girls. I think part of the problem is he's over-weight, as he had lots of food but not much room to exercise. But even with this, his feet are much bigger (and furrier!) than the other 3.

I remember reading that sometimes hybrid mums can struggle to give birth due to the size of the babies, is it just that Campbells are bigger than Winter Whites, and Max reflects that side of his genetics more? I'm just curious, as he's twice the size of my tiny Frohike!