ΔE 6.3, close: similar, with a visible difference side by side. IJN Dk Black Green is a little darker than Eshin Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). IJN Dk Black Green is a little darker than Eshin Grey.
The same difference applies the other way round: Eshin Grey is a little lighter.
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 Eshin Grey on the colour wheel See IJN Dk Black Green on the colour wheel
All matches: Eshin Grey equivalents · IJN Dk Black Green equivalents