ΔE 14.2, fair: the same colour family, but not a straight swap. Dark Green Nakajima is noticeably lighter, more muted, warmer than Lupercal Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Green Nakajima is noticeably lighter, more muted, warmer than Lupercal Green.
The same difference applies the other way round: Lupercal Green is noticeably darker, more saturated, 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 Lupercal Green on the colour wheel See Dark Green Nakajima on the colour wheel
All matches: Lupercal Green equivalents · Dark Green Nakajima equivalents