Drab Green vs Orc Hide

How close are they?

ΔE 22.6, loose: different enough that you should pick on purpose. Orc Hide is noticeably lighter, more muted, cooler than Drab Green.

Can I use Orc Hide instead of Drab Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Orc Hide is noticeably lighter, more muted, cooler than Drab Green.

Can I use Drab Green instead of Orc Hide?

The same difference applies the other way round: Drab Green is noticeably darker, 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.