Ok heres the skinny on the names. A pastel is a pastel.. However long time a go in a galaxy far far away..Ok not really.
Here's what happened certain breeders line bred to produce a particular look in the same mutation. Graziani bred for flames and blushing, Kevin bred for bright bright yellows, Mark and Kim Bell bred for a different look. So thats where you get different lines of pastels. Its all the same gene just different looks of that gene.
Hope that helps.