Just to clarify, there are really three types of Ducks, not two. (as far as I know)
1. The original David Loo DD68 Kamikazee Shooters, nicknamed the "Desert Duck"
2. The Carter made Desert Ducks, which are close to the original. Carter was also involved in completing some of the originals I believe
3. The Redux. A new design that outwardly looks a lot like the original but is really a new gun.