Red Brown 2 vs Flat Earth

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Flat Earth is more saturated, warmer than Red Brown 2.

Can I use Flat Earth instead of Red Brown 2?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Flat Earth is more saturated, warmer than Red Brown 2.

Can I use Red Brown 2 instead of Flat Earth?

The same difference applies the other way round: Red Brown 2 is more muted, 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.