Yes, the .22WMR diameter is a hair larger than .22LR diameter. Someone will be along shortly to tell us what the difference is.
My first handgun was a Colt SA .22 with dual cylinders. Accuracy was so-so, but the bore was such that it wasn't cut absolutely for either caliber as all dual cylinder guns are.
Unless one is hunting with it in .22WMR, *I* would stick to a dedicated caliber.
My .o2