Yes. NC15 is a lot lighter. I was matched NC15 recently...I thought I was NC20. Got home, tried it and I seriously look like a ghost. Went back to MAC and purchased NC20 and it is a bit dark, but not that bad. I think i'm the only one who notices, honestly. What I do most of the time is mix the two colors and it makes the perfect shade (i'm only going to do this long enough to use up NC15, then i'm sticking with NC20.) If you don't want to purchase both shades, try NC15 and using a MSFN over the foundation in a shade that is just a bit darker.