Angel Green vs Serpent Shadow

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Serpent Shadow is a little darker, cooler than Angel Green.

Can I use Serpent Shadow instead of Angel Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Serpent Shadow is a little darker, cooler than Angel Green.

Can I use Angel Green instead of Serpent Shadow?

The same difference applies the other way round: Angel Green is a little lighter, warmer.

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.