Military Green vs Ink Black Green

How close are they?

ΔE 49.1, loose: different enough that you should pick on purpose. Ink Black Green is noticeably darker, much more muted, cooler than Military Green.

Can I use Ink Black Green instead of Military Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 49). Ink Black Green is noticeably darker, much more muted, cooler than Military Green.

Can I use Military Green instead of Ink Black Green?

The same difference applies the other way round: Military Green is noticeably lighter, much more saturated, 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.