Ok, let me see if I get it. I'd guess the bone is all basically the same; that is, from a cow's leg or something. Right?

Regarding the Remington and Napanoch, these are pieces of bone "prepared" (cut, dried, tinted, carved...) by each manufacturer? Thus, when a knifemaker uses a particular type of bone is because he got some of the bone remaining from either Remington or Napanoch in this case?