ΔE 9.4, close: similar, with a visible difference side by side. Nurgling Green is a little darker, more saturated, warmer than WWI German Light Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Nurgling Green is a little darker, more saturated, warmer than WWI German Light Green.
The same difference applies the other way round: WWI German Light Green is a little lighter, 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 WWI German Light Green on the colour wheel See Nurgling Green on the colour wheel
All matches: WWI German Light Green equivalents · Nurgling Green equivalents