ΔE 9.9, close: similar, with a visible difference side by side. IJN Green Nakajima is a little darker, warmer than Lupercal Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). IJN Green Nakajima is a little darker, warmer than Lupercal Green.
The same difference applies the other way round: Lupercal Green 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 Lupercal Green on the colour wheel See IJN Green Nakajima on the colour wheel
All matches: Lupercal Green equivalents · IJN Green Nakajima equivalents