ΔE 11.3, fair: the same colour family, but not a straight swap. Earth Brown is a little lighter, more muted, warmer than Dryad Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Earth Brown is a little lighter, more muted, warmer than Dryad Brown.
The same difference applies the other way round: Dryad Brown is a little darker, more saturated, cooler.
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 Brown on the colour wheel See Earth Brown on the colour wheel
All matches: Dryad Brown equivalents · Earth Brown equivalents