The members of the Marans community need to weigh in on these differences while the Standards are being considered. There are examples of breed colors that are slightly different than other breeds having the same color designation, so the APA can't hold a breed to a color description that will not work. After I see the official color description, we can talk about it. As of now all I know about birchen Marans is what I read here. The pics of birchen Marans on the French site appear to have red faces, wattles and combs.
Walt