Military Shader vs Moss Green

How close are they?

ΔE 38.6, loose: different enough that you should pick on purpose. Moss Green is noticeably lighter, much more saturated, cooler than Military Shader.

Can I use Moss Green instead of Military Shader?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 39). Moss Green is noticeably lighter, much more saturated, cooler than Military Shader.

Can I use Military Shader instead of Moss Green?

The same difference applies the other way round: Military Shader is noticeably darker, much more muted, 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.