Here's the colors from online:
I absolutely CANNOT tell the difference!
Even closeup the difference is impossible to see. I even had to make a note to myself which brand I put on which finger. I wasn't planning on this and wish I had chosen a different color from M.A.C. To add to all of my sadness, it's my opinion that Nicole by OPI is a better polish- it went on smoother, the brush was bigger, and it was easier on the wallet (although the link that I included from Amazon on the Nicole polish was selling it for $20, but I got it at Wal-Mart for $11.) With all this being said, I almost wish I hadn't done the comparison.