Olivgrün vs Death Korps Drab

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Death Korps Drab is more muted, warmer than Olivgrün.

Can I use Death Korps Drab instead of Olivgrün?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Death Korps Drab is more muted, warmer than Olivgrün.

Can I use Olivgrün instead of Death Korps Drab?

The same difference applies the other way round: Olivgrün is more saturated, 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.