Henlei vary almost as much as the definition of a BD. They come in grey, brown, and black, though usually not as dark as a Leopoldi/BD. Just look around in the gallery for examples of henlei. As far as size goes they are going to be about the same.
bd and hens are not the same they are way different. only 2 common treats their black sometimes with hens and have parameter thats it. put them side by side 150 percent every one will no the difference.