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