Though they seem rather similar on the surface and even at first glance, I think the shade ranges differ enough where there is less overlap than expected. For instance, I could not find dupes for Urban Decay’s Midnight Cowboy, Clinic, Narc, or Lit at all. However, I think that Urban Decay’s Sin and Clash definitely have dupes, while Delinquent has something similar but there is a noticeable difference in quality that makes them different.
I think that Rehab and Barracuda may also lack dupes, but I do not have the appropriate NYX shades to tell you for sure. Mercury and Wasteland may have dupes, but again, I can’t say for sure.
I don’t have all of NYX’s Jumbo Eye Pencils, but based on Dusty’s swatches that he did for Temptalia back in April, here are my thoughts on some possible similarities:
What about the formulas?