Even though, you can't see the true color of FH, you can definitely see that it's not dupish to CK. They are cousins, but not twins. Aside from the shimmer, CK is greener than FH.
Believe it or not, to me, FH looks like a blue version of Misa Dirty Sexy Money. Here's a comp pic.
From left to right, this is Illamasqua Muse, ChG Flyin' High, Misa DSM, and ChG Aqua Baby. You can see the dusty-ness of FH, even if you can't see the true color (which is a dusty, mid-to-light tone teal). Behind Muse, it's my favorite teal. Loves it.