Sand Grey vs Cayman Green

How close are they?

ΔE 6.1, close: similar, with a visible difference side by side. Cayman Green is more saturated than Sand Grey.

Can I use Cayman Green instead of Sand Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Cayman Green is more saturated than Sand Grey.

Can I use Sand Grey instead of Cayman Green?

The same difference applies the other way round: Sand Grey is more muted.

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.