ΔE 14.6, fair: the same colour family, but not a straight swap. Dryad Bark is much more muted than Dark Olive Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Dryad Bark is much more muted than Dark Olive Green.
The same difference applies the other way round: Dark Olive Green is much 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 Dark Olive Green on the colour wheel See Dryad Bark on the colour wheel
All matches: Dark Olive Green equivalents · Dryad Bark equivalents