Olive Drab vs Death Korps Drab

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. Death Korps Drab is a little lighter than Olive Drab.

Can I use Death Korps Drab instead of Olive Drab?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Death Korps Drab is a little lighter than Olive Drab.

Can I use Olive Drab instead of Death Korps Drab?

The same difference applies the other way round: Olive Drab is a little darker.

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.