ΔE 12.0, fair: the same colour family, but not a straight swap. IJN Deep Dark Green is a little lighter, more saturated than Blackroot Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). IJN Deep Dark Green is a little lighter, more saturated than Blackroot Grey.
The same difference applies the other way round: Blackroot Grey is a little darker, more muted.
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 Blackroot Grey on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Blackroot Grey equivalents · IJN Deep Dark Green equivalents