Tree Ancient vs Oxide Brown Medium

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Oxide Brown Medium is more saturated, cooler than Tree Ancient.

Can I use Oxide Brown Medium instead of Tree Ancient?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Oxide Brown Medium is more saturated, cooler than Tree Ancient.

Can I use Tree Ancient instead of Oxide Brown Medium?

The same difference applies the other way round: Tree Ancient is more muted, 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.