Pestilent Flesh vs Cayman Green

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Cayman Green is a little darker, warmer than Pestilent Flesh.

Can I use Cayman Green instead of Pestilent Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Cayman Green is a little darker, warmer than Pestilent Flesh.

Can I use Pestilent Flesh instead of Cayman Green?

The same difference applies the other way round: Pestilent Flesh is a little lighter, cooler.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.