ΔE 10.1, fair: the same colour family, but not a straight swap. Lupercal Green is a little lighter, cooler than NATO Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Lupercal Green is a little lighter, cooler than NATO Green.
The same difference applies the other way round: NATO Green is a little darker, 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 NATO Green on the colour wheel See Lupercal Green on the colour wheel
All matches: NATO Green equivalents · Lupercal Green equivalents