I'M also nc-40, and I'm toally loving Melba right now. I got it maybe three weeks ago, and i've been wearing it much more then any other blush right now. I also want to try Pinch Me, I had a "dupe" for it and loved it, so I'm sure the real thing would be awesome!
Oh! Quick description of Melba on me... It's a little more neutral, pink but slightly coral-y. I'm loving it
Yeah I'm C7/NC45 and I wouldn't touch it, so I don't think it would work for NW45. You should see if Nars has a color like what you looking for from Melba and Pinch Me. Nars blushes are way more pigmented, so the colors are more universal in that way.