Pale Earth vs Death Korps Drab

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Death Korps Drab is a little darker, cooler than Pale Earth.

Can I use Death Korps Drab instead of Pale Earth?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Death Korps Drab is a little darker, cooler than Pale Earth.

Can I use Pale Earth instead of Death Korps Drab?

The same difference applies the other way round: Pale Earth 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.