The jaguar morph is GENERALLY considered to be associated coastal carpet pythons. This is not 100% accepted as the purity of the original jag isn't certain.

The morph has since been crossed into jungles (and other subspecies), so any jungle jags are not 100% jungle. Any jungle jag sibs aren't 100% jungles, so one reason to identify them as such is to inform potential buyers that the jungle-looking python is in fact not a pure jungle.