I bet the New Mexican Chili Powder has some more cheyenne pepper or some hot pepper in it that regular chili pepper don't have. If you have eaten this receipe before with regular chili powder, I would just add and then taste until you get the taste you remember or want. Sometime I have made dishes where they call for more jalapenos than I would normally put but when I tasted it, it did need the extra kick and then I have got lazy and just poured the japapeno juice in there untill I got the taste I wanted. Better than getting the peppers on my hands again,plus I got the same results. Just try that's the best you can do,and I bet it will be delicious.
