Canopy Green vs Zombie Flesh

How close are they?

ΔE 18.8, loose: different enough that you should pick on purpose. Zombie Flesh is much more muted, warmer than Canopy Green.

Can I use Zombie Flesh instead of Canopy Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Zombie Flesh is much more muted, warmer than Canopy Green.

Can I use Canopy Green instead of Zombie Flesh?

The same difference applies the other way round: Canopy Green 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.