Barren Yellow vs Beasty Brown

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Beasty Brown is warmer than Barren Yellow.

Can I use Beasty Brown instead of Barren Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Beasty Brown is warmer than Barren Yellow.

Can I use Barren Yellow instead of Beasty Brown?

The same difference applies the other way round: Barren Yellow is 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.