Budgie Colours Blue Series

Hi peeps,

I have a cobalt blue female and I am looking at purchasing one of these two birds in the pictures.

Can any one tell me what series of blue they are. Someone said mauve and cobalt (left to right) and another person said sky-blue and cobalt ( left to right).

Any help would be greatly appreciated.

I've also posted a picture of the one on the left on its own as you can see it's colours more clearly