Dryad Brown vs Burnt Umber

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Burnt Umber is a little darker, more muted, warmer than Dryad Brown.

Can I use Burnt Umber instead of Dryad Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Burnt Umber is a little darker, more muted, warmer than Dryad Brown.

Can I use Dryad Brown instead of Burnt Umber?

The same difference applies the other way round: Dryad Brown is a little lighter, 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.