ΔE 8.7, close: similar, with a visible difference side by side. Gorthor Brown is a little lighter, warmer than Dryad Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gorthor Brown is a little lighter, warmer than Dryad Brown.
The same difference applies the other way round: Dryad Brown is a little darker, 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 Gorthor Brown on the colour wheel
All matches: Dryad Brown equivalents · Gorthor Brown equivalents