ΔE 7.1, close: similar, with a visible difference side by side. Earth Green is a little darker, warmer than Dark Soviet Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Earth Green is a little darker, warmer than Dark Soviet Khaki.
The same difference applies the other way round: Dark Soviet Khaki is a little lighter, 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.
See Dark Soviet Khaki on the colour wheel See Earth Green on the colour wheel
All matches: Dark Soviet Khaki equivalents · Earth Green equivalents