Maybe one is slightly newer then the other, like later on in production they started using a slightly different mouth piece? But not new enough for it to be considered a "new generation", and the change was so minor too? I have no idea really, those are just guesses. They both run the same right? Oh, or maybe someone repaired him with the mouth of a 3rd gen Teddy? My Teddy has a metal cassette, and im pretty sure his mouth looks like the first picture.