ΔE 10.0, close: similar, with a visible difference side by side. Nurgling Green is a little darker, warmer than Green Sky.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Nurgling Green is a little darker, warmer than Green Sky.
The same difference applies the other way round: Green Sky is a little lighter, 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 Green Sky on the colour wheel See Nurgling Green on the colour wheel
All matches: Green Sky equivalents · Nurgling Green equivalents