Yep. My big ol' heavy WRs will lay a large egg every time~just like me they are built and have the capacity to produce a bigger offspring(my biggest was 10#). Actually, most all the different breeds I have and keep lay eggs about the same size. I think that uniform, grade A large egg is pretty standard for healthy chickens in their prime of laying life. The smallest eggs I get are from my smallest hens~a BA and a NH. The Dels, WRs, bigger BAs, RIR, Leghorn, etc., will all lay eggs that are pretty uniform in size.
I strive for a uniform egg and I keep an eye on any bird putting out excessively huge eggs and consistent double yolkers...this is a bird that usually won't have a long laying life and may develop laying issues or ovulation problems. It's kind of neat to get those kinds of eggs every now and again, but for the life of my layers I prefer to get that steady grade A large, perfectly shaped egg.