Believe it or not it's the same green chile. Red chile is made by drying the pods (which turn red in the process. Have you seen ristras?) and then grinding them.

Here is a link that might be useful: new mexico chile

Yup - they're the same pepper. I'm not positive what variety of pepper is used, I always assumed they were Anaheims. You can pick them green, or let them ripen to red on the plant - you don't have to dry them to get them red, just let 'em ripen some more on the plant.

Here is a link that might be useful: peppers

Thanks, all, for the info! Much appreciated!

Lindsey :)