I have 6 that are almost 4 weeks with the same situation. Five started out a pale buff with red chipmunk stripes down the back (one had a red head, too), and one was solid red. When they started feathering out, the red ones wings were copper with black bars, while the others were that pale cream/buff color. Now that they're older, the paler ones have started getting coppery feathers on their chests and backs, so the differences are far less noticeable.
Personally, I think Georgiana's just some other breed--Comets are sex-linked, so it would take some serious genetic abnormality for the reddest chick to be male. And after all, I did buy them from a bin marked "Assorted Red Pullets" with a handwritten G. Comet underneath. If you buy from a bin marked assorted, you can't really fuss if you wind up with an assortment.