ΔE 15.0, fair: the same colour family, but not a straight swap. Dryad Bark is a little lighter, more muted than Reddish Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Dryad Bark is a little lighter, more muted than Reddish Black.
The same difference applies the other way round: Reddish Black 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 Reddish Black on the colour wheel See Dryad Bark on the colour wheel
All matches: Reddish Black equivalents · Dryad Bark equivalents