Banshee Brown vs Terran Khaki

How close are they?

ΔE 6.1, close: similar, with a visible difference side by side. Terran Khaki is a little lighter, cooler than Banshee Brown.

Can I use Terran Khaki instead of Banshee Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Terran Khaki is a little lighter, cooler than Banshee Brown.

Can I use Banshee Brown instead of Terran Khaki?

The same difference applies the other way round: Banshee Brown is a little darker, 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.