ΔE 21.6, loose: different enough that you should pick on purpose. Zombie Skin is much more muted, cooler than Aggaros Dunes.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Zombie Skin is much more muted, cooler than Aggaros Dunes.
The same difference applies the other way round: Aggaros Dunes is much 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.
See Aggaros Dunes on the colour wheel See Zombie Skin on the colour wheel
All matches: Aggaros Dunes equivalents · Zombie Skin equivalents