Mid Soviet Khaki vs Ground Brown

How close are they?

ΔE 23.1, loose: different enough that you should pick on purpose. Ground Brown is a little lighter, much more muted, warmer than Mid Soviet Khaki.

Can I use Ground Brown instead of Mid Soviet Khaki?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Ground Brown is a little lighter, much more muted, warmer than Mid Soviet Khaki.

Can I use Mid Soviet Khaki instead of Ground Brown?

The same difference applies the other way round: Mid Soviet Khaki is a little darker, much more saturated, 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.