I am not certain how much redder the back of a Red-backed Junco is than that of a Gray-headed. However, Red-backed Juncos are somewhat larger billed and have more extensive black on the bill.
Last winter, I had a bird that has been judged a good candidate for a Red-backed x Gray-headed Junco at Red Rocks, viewable at http://www.flickr.com/photos/36088296@N08/6860773311/in/set-72157630054609698/ and the preceding photo in that set
Good Birding
Steven Mlodinow
Longmont CO
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