Dryad Bark vs Extra Dark Green

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Extra Dark Green is a little darker, more saturated than Dryad Bark.

Can I use Extra Dark Green instead of Dryad Bark?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Extra Dark Green is a little darker, more saturated than Dryad Bark.

Can I use Dryad Bark instead of Extra Dark Green?

The same difference applies the other way round: Dryad Bark is a little lighter, 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.