ΔE 15.9, loose: different enough that you should pick on purpose. Van Dyke Brown Hue is noticeably darker, more muted than Dryad Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Van Dyke Brown Hue is noticeably darker, more muted than Dryad Brown.
The same difference applies the other way round: Dryad Brown is noticeably lighter, 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 Dryad Brown on the colour wheel See Van Dyke Brown Hue on the colour wheel
All matches: Dryad Brown equivalents · Van Dyke Brown Hue equivalents