ΔE 7.1, close: similar, with a visible difference side by side. Eclipse Grey is a little lighter, more muted than Dryad Bark.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Eclipse Grey is a little lighter, more muted than Dryad Bark.
The same difference applies the other way round: Dryad Bark is a little darker, 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.
See Dryad Bark on the colour wheel See Eclipse Grey on the colour wheel
All matches: Dryad Bark equivalents · Eclipse Grey equivalents