The size difference shouldn't make a difference to them. They might even like it more.
41qts is the typical adult BP size rack enclosure.

But if you wanted to give them more room, you can try looking into small boa sized racks, which is a little larger.
And Freedom Breeder, while expensive, has nice sized rack tubs with viewing windows. I've always liked how they looked, but were a little to large for my personal liking. Maybe they would find your fancy.