I am sure many of you are already aware of this, but I thought I would put it out there in black & white.
OPI Rainbow Connection (Muppets Holiday 2011) and Nicole Rainbow in the S-Kylie (Kardashian Kolors Collection) are the same polish. To be clear, they are not just dupes, they are literally the same.
Pick the one you want. I hate the Nicole bottle shape, so I won't be buying one of my own! Now that I have had a chance to play with Rainbow Connection, I will probably pick up my own bottle. I wanted to play with it in person first to be sure it wasn't just another Deborah Lippmann Happy Birthday dupe.