Barrel Grey vs Extra Dark Green

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Extra Dark Green is more saturated than Barrel Grey.

Can I use Extra Dark Green instead of Barrel Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Extra Dark Green is more saturated than Barrel Grey.

Can I use Barrel Grey instead of Extra Dark Green?

The same difference applies the other way round: Barrel 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.