Command Green vs Dark Soviet Khaki

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Dark Soviet Khaki is a little lighter, warmer than Command Green.

Can I use Dark Soviet Khaki instead of Command Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dark Soviet Khaki is a little lighter, warmer than Command Green.

Can I use Command Green instead of Dark Soviet Khaki?

The same difference applies the other way round: Command Green is a little darker, 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.