Algae Green vs Ork Flesh

How close are they?

ΔE 22.0, loose: different enough that you should pick on purpose. Ork Flesh is noticeably darker, more muted, cooler than Algae Green.

Can I use Ork Flesh instead of Algae Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Ork Flesh is noticeably darker, more muted, cooler than Algae Green.

Can I use Algae Green instead of Ork Flesh?

The same difference applies the other way round: Algae Green is noticeably lighter, 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.