This may be true. I am guessing it would take an experienced eye to be able to determine the difference.
So the California Gray and the Barred Leghorn are the same general weight and size? I do not understand why California Gray would be called a dual-purpose breed, then.
Again, I think that would be a problem if someone tried to get the California Gray recognized by the APA.
Given that the APA is irrelevant to practical poultry raising or commercial raising, the question isn't one of pressing concern. The APA focuses on appearances; the poultrymen focus on utility.