ΔE 5.9, very close: most people won’t see a difference side by side. IJN Deep Dark Green is a little lighter, cooler than Riff Green.
Yes, for most jobs. Very close match (ΔE 6). IJN Deep Dark Green is a little lighter, cooler than Riff Green.
The same difference applies the other way round: Riff Green is a little darker, 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 Riff Green on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Riff Green equivalents · IJN Deep Dark Green equivalents