Gladeshard vs Army Green

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Army Green is much more muted, warmer than Gladeshard.

Can I use Army Green instead of Gladeshard?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Army Green is much more muted, warmer than Gladeshard.

Can I use Gladeshard instead of Army Green?

The same difference applies the other way round: Gladeshard is 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.