Dark Earth BS381C/450 vs Dark Green RLM71

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Dark Green RLM71 is a little darker, cooler than Dark Earth BS381C/450.

Can I use Dark Green RLM71 instead of Dark Earth BS381C/450?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Green RLM71 is a little darker, cooler than Dark Earth BS381C/450.

Can I use Dark Earth BS381C/450 instead of Dark Green RLM71?

The same difference applies the other way round: Dark Earth BS381C/450 is a little lighter, 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.