Maggot Skin vs Zombie Skin

How close are they?

ΔE 19.7, loose: different enough that you should pick on purpose. Zombie Skin is noticeably darker, more muted than Maggot Skin.

Can I use Zombie Skin instead of Maggot Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Zombie Skin is noticeably darker, more muted than Maggot Skin.

Can I use Maggot Skin instead of Zombie Skin?

The same difference applies the other way round: Maggot Skin is noticeably lighter, more saturated.

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.