ΔE 7.9, close: similar, with a visible difference side by side. Dark Soviet Khaki is a little darker, warmer than NATO Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Soviet Khaki is a little darker, warmer than NATO Green.
The same difference applies the other way round: NATO Green 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 NATO Green on the colour wheel See Dark Soviet Khaki on the colour wheel
All matches: NATO Green equivalents · Dark Soviet Khaki equivalents