ΔE 9.1, close: similar, with a visible difference side by side. BS Dark Green is a little lighter than Dryad Bark.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). BS Dark Green is a little lighter than Dryad Bark.
The same difference applies the other way round: Dryad Bark is a little darker.
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.
See Dryad Bark on the colour wheel See BS Dark Green on the colour wheel
All matches: Dryad Bark equivalents · BS Dark Green equivalents