Zombie Flesh vs Dead Flesh

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Dead Flesh is a little lighter than Zombie Flesh.

Can I use Dead Flesh instead of Zombie Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dead Flesh is a little lighter than Zombie Flesh.

Can I use Zombie Flesh instead of Dead Flesh?

The same difference applies the other way round: Zombie Flesh is a little darker.

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.