not true, rhode Island Reds also sport black tail feathers, a Rhode Island Red is darker in color compared to a new hampshire, they are a nice dark chestnut color and the New hampshires are more of a faded red or light red, as they were not breed for color but egg production.
I dont know if this helps or not, but I do have a white leghorn pullets and golden sex link pulltes the same age, and there combs are a lot smaller and they are all smaller in general.