ΔE 22.4, loose: different enough that you should pick on purpose. Olive Green (USAF) is noticeably darker, much more muted, cooler than Nurgling Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Olive Green (USAF) is noticeably darker, much more muted, cooler than Nurgling Green.
The same difference applies the other way round: Nurgling Green is noticeably lighter, much 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 Olive Green (USAF) on the colour wheel
All matches: Nurgling Green equivalents · Olive Green (USAF) equivalents