I was picking out a Turtledove Lunemara in Advanced Search and noticed that all have slightly different color sets:

like most other themes. However, the variation on this theme can give the wings an unfortunate greenish tinge. Then again, there was an Infernal Spectral Ny'vene that had pale chartreuse eyes instead of orange, because this seems to happen with all themes.
I was wondering what the actual range of variation from the designated set of themes was? Is it comparable to a regular, enhanced, or majestic essence?