L-R: Wet n Wild Blazed, Sinful Colors Island Coral, Butter London Trout Pout, Sally Hansen Coral Fever
I have a coral problem. They speak to my heart and are the perfect shade for my skin tone regardless of the season. I was going through my collection and noticed these four shades look super similar, so I swatched them on a nail wheel to see how they all compare to Trout Pout..and ... here we are!

WnW Blazed is more peach toned and darker than Trout Pout. Sally Hansen Coral Fever is also darker, but more pink toned.
Now, Sinful Colors Island Coral is a bit thin. That's three coats. I obviously didn't wait for any of these layers to dry so it looks like my nail wheel is melting. ANYWAY! Sinful Colors Island Coral, in my opinion, is a dupe for Butter London Trout Pout. Trout Pout has a much better formula. It's a bit thicker. That's two coats in the photo. But, ignoring the bald spots in Island Coral and the colors aren't that discernible!
If you want Trout Pout but don't to shell out $14 for it, go buy Sinful Colors Island Coral for .99 cents this week (regularly 1.99 at Walgreen's). The formula is different but the color is the same! I'm sitting here with my nail wheel right up to my face and I cannot see a difference.
Thoughts?