ΔE 10.6, fair: the same colour family, but not a straight swap. US Dark Green is a little lighter than Dryad Bark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). US 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 US Dark Green on the colour wheel
All matches: Dryad Bark equivalents · US Dark Green equivalents