Dark Soviet Khaki vs Luftwaffe Green

How close are they?

ΔE 8.1, close: similar, with a visible difference side by side. Luftwaffe Green is a little darker, cooler than Dark Soviet Khaki.

Can I use Luftwaffe Green instead of Dark Soviet Khaki?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Luftwaffe Green is a little darker, cooler than Dark Soviet Khaki.

Can I use Dark Soviet Khaki instead of Luftwaffe Green?

The same difference applies the other way round: Dark Soviet Khaki 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.