Some people claim het Hypo's (assorted Ghost lines) can have almost clear sheds like the homozygous Hypo's. But the visual appearance of the animal should remain the same. I have no idea if this is more prevalent in specific Ghost lines or occurs in all lines equally.
Any hold-backs from this pairing will have a 50% chance of producing visual Ghosts if bred to a visual Ghost and a 25% if bred to a 100% het.