Doombull Brown vs Berserker Red

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Berserker Red is a little darker than Doombull Brown.

Can I use Berserker Red instead of Doombull Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Berserker Red is a little darker than Doombull Brown.

Can I use Doombull Brown instead of Berserker Red?

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

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.