Answer:
It's really easy to tell the difference apart of Japanese akita and American Akitas. (only for adults, but sometimes puppies)
Japanese akitas have only 3 colors, Red (that looks like brown), brindle (tiger pattern), and white.
Im not sure, but American Akitas have more than at least 5 colors. Like pinto, Etc.
Japanese Akitas DOESN'T have any "black masks" on their face. (it means the color black, isn't on their face. so u can see their eyes, nose and everything black on their face.) Anyway, American akitas have black masks. I do not like them because I cant see their face.
I have a pure bred, red Japanese akita. And I got him from a breeder.when he was a puppy, he had some black on his muzzle but then, when he got older it "vanished"
HOPE THIS HELPED