does anyone know what the difference's are between a 'red coachwhip' and a 'red phase western' ?

Partly as I have taken on some 'red' hatchlings, and I'm not sure which type they are. Plus I have currently 2 adult reds that are pure red ones.

In fact does anyone know any links or books that will help to find out what types of coachwhips come over here.

Mike