Gnarls Green vs Dark Green

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Dark Green is more muted than Gnarls Green.

Can I use Dark Green instead of Gnarls Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Green is more muted than Gnarls Green.

Can I use Gnarls Green instead of Dark Green?

The same difference applies the other way round: Gnarls Green is more saturated.

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.