Yeah, MAC foundations are all over the place with their colors. it is really hard to get a good match, and even if you do in one formula it most likely won't work in another. I think the best product MAC makes is the white F&B because I need to add it to almost all of their foundations! Not even because I am crazy pale, but because I am really neutral when compared to their formulations. For instance there isn't a single color of SFF that I can wear because they are all too "colorful", not even too dark, just crazy pink or peach or yellow or orange. I think Studio Sculpt was the one really good match for my skin but I had to return it too because it clogged all my pores
I think that this Mineralize Moisture, for ME, is the most neutral and wearable of all the MAC foundations, and the color is really forgiving on.....it kind of meshes with your skin after a few minutes.
You might want to give it a try in the NC15.