I could ask if you have you examined a Buckeye chicken to see if their feathers haven't adapted to the cooler climate just like the Huskie's fur or the Maine Coon's paw but I know you haven't. I will assume that you mean that there is no scientific literature that states this as a fact. I would respond that the lack of a scientific study does not mean that it is not so.The Husky dog can live comfortably in sub zero temperatures because it's fur is different to other dogs who live in more temperate climates.
I myself have no idea. I have never examined a Buckeye chicken nor would I know what I'm looking for. I do however believe it is foolish to believe that it is not possible. Animals are amazing and all kinds of animals have been able to adapt and survive in extreme environments. In fact, even if it is not true today, it does not mean that they could not adapt and thrive. Chickens have proven time and again how adaptable they are.