ΔE 6.9, close: similar, with a visible difference side by side. Traitor Green is more muted, cooler than Nurgling Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Traitor Green is more muted, cooler than Nurgling Green.
The same difference applies the other way round: Nurgling Green 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 Nurgling Green on the colour wheel See Traitor Green on the colour wheel
All matches: Nurgling Green equivalents · Traitor Green equivalents