I can't give advise about the nutritional content, but if it has any red dyes in the ingredient list, especially Red Dye 40, I wouldn't give it to them. There have been studies on the ill effects of dyes on rodents, and while there haven't been any studies that I know of looking at the effects of feeding said rodents to snakes, I would not risk the health of my snakes.

Here's a link to a few of the studies: http://www.feingold.org/Research/dye-studies.html