Thanks for the info, Kermit!
Yes, it is almost impossible to tell with photos when it comes to color (especially a tricky color like this.)
It does have a creamy yellow throat and part of the underside of the hood is creamy yellow. Photos of some other cultivars seem to have this, too, so I'm still not sure...and probably never will be!
I'm sad to hear that this is a hard color to breed because it is one of my favorites. I love peach and melon colors!
Out of curiosity, what colors of seedlings are your pastel orange plants mostly producing?
Looking at the flowers on mine there appears to be separate layers of pigment with one layer being pink and another light yellow which overlap to give the "peachy" color.