ΔE 10.0, close: similar, with a visible difference side by side. IJN Deep Dark Green is a little lighter, more muted than Emerald Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). IJN Deep Dark Green is a little lighter, more muted than Emerald Green.
The same difference applies the other way round: Emerald Green is a little darker, more saturated.
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 Emerald Green on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Emerald Green equivalents · IJN Deep Dark Green equivalents