First, here's a direct link to the 4001 Autumnglo refered to:
http://personal.nbnet.nb.ca/mccorp/774001autumnglo.html
Second, from my readings here in the Forum and elsewhere, Walnut is the gloss version of Autumnglo, which is a satin finish.
Third, I agree with Peter that digital pictures can be misleading. Experience with my Olympus D-400Z digital camera has shown repeatedly that reds are not always accurately rendered, depending (in a convoluted way) on the ambient lighting, use of flash, and exposure compensation used. Saying that, here is a picture of Walnut and Fireglo 4001's side-by-side:
This was the best exposure out of about six taken, with and without flash; this one was with no flash, no exposure compensation, ambient indirect lighting (mix of natural and incandescent). The Walnut looks almost identical to its actual color, but the Fireglo's color looks a little pinker than its actual color.