ΔE 9.1, close: similar, with a visible difference side by side. Nurgling Green is more muted, cooler than Pestilent Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Nurgling Green is more muted, cooler than Pestilent Flesh.
The same difference applies the other way round: Pestilent Flesh is 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 Pestilent Flesh on the colour wheel See Nurgling Green on the colour wheel
All matches: Pestilent Flesh equivalents · Nurgling Green equivalents