ΔE 11.3, fair: the same colour family, but not a straight swap. IJN Deep Dark Green is more muted, cooler than Dark Jade.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). IJN Deep Dark Green is more muted, cooler than Dark Jade.
The same difference applies the other way round: Dark Jade is more saturated, warmer.
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 Dark Jade on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Dark Jade equivalents · IJN Deep Dark Green equivalents