Also, Alden, as far as I know, doesn't have a shade they call "Walnut" or at least it's not a very popular name. They have Whiskey which is, in fact, a dyed shell, not a shade of natural, and doesn't darken or patina the way that naturals do. This is just an example that frustrates the conversation even more. Many places do use Alden's naming conventions, though. Especially smaller, handcrafted accessory makers.
My real point is that, outside of the general idea of the color you're ordering, people shouldn't get too hung up on which shade of that color they get. I see people in the Alden and AE threads get upset if their conception of a shell is different than what it sometimes looks like, people should know that there is going to be a lot of variety in their trench boots as well.