Dark Wood vs Warm Brown

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Warm Brown is a little lighter, more muted, cooler than Dark Wood.

Can I use Warm Brown instead of Dark Wood?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Warm Brown is a little lighter, more muted, cooler than Dark Wood.

Can I use Dark Wood instead of Warm Brown?

The same difference applies the other way round: Dark Wood is a little darker, more saturated, warmer.

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.