ΔE 8.2, close: similar, with a visible difference side by side. Zombie Flesh is more saturated, warmer than Deck Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Zombie Flesh is more saturated, warmer than Deck Grey.
The same difference applies the other way round: Deck Grey is more muted, 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.
See Deck Grey on the colour wheel See Zombie Flesh on the colour wheel
All matches: Deck Grey equivalents · Zombie Flesh equivalents