Munchkins can only be registered as Munchkins if their pedigree includes Munchkins and domestic cats, no purebreds are allowed. The registration number must have "0" in the middle or SBT/SBV to be "pure" Munchkins. The "N" indicates an unacceptable outcross. These cats can not be shown.
You can not breed a Munchkin to a pedigreed cat and call it a Munchkin. No such thing, for example, as a Ragdoll Munchkin. If you breed a Munchkin to a Manx, it is not a Manx Munchkin or Manxskin, it is a illegal hybrid. You may see registration papers but note they will say on them "Not Eligible for Championship Competition"
The Genetta is a Bengal X Munchkin hybrid. Not accepted for Championship competition.
This does not mean they are accepted breeds. It only means TICA has issued paperwork to track the cats.