Fang Grey vs Zombie Flesh

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. Zombie Flesh is more saturated, cooler than Fang Grey.

Can I use Zombie Flesh instead of Fang Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Zombie Flesh is more saturated, cooler than Fang Grey.

Can I use Fang Grey instead of Zombie Flesh?

The same difference applies the other way round: Fang Grey is 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.