ΔE 9.0, close: similar, with a visible difference side by side. Dryad Bark is a little darker than IJN D2 Green Black.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dryad Bark is a little darker than IJN D2 Green Black.
The same difference applies the other way round: IJN D2 Green Black is a little lighter.
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 IJN D2 Green Black on the colour wheel See Dryad Bark on the colour wheel
All matches: IJN D2 Green Black equivalents · Dryad Bark equivalents