Red shoulders isn't necessarily a hybrid trait, although granted, it's hard to say if there are any pure green cheeks within captivity anyway... at least in North America... and even if they are "pure", there's information that states they may have naturally hybridized with maroon bellied conures.
I don't see anything that says this bird is in fact a hybrid and would need to see more photos. Even then, I can't say I'd be able to identify whether or not the bird is "pure" or hybrid. Just looks like a slightly high red opaline green cheek conure.
(if you ever come back to read this)