ΔE 15.8, loose: different enough that you should pick on purpose. IJN Deep Dark Green is a little lighter, cooler than Cryx Bane Base.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). IJN Deep Dark Green is a little lighter, cooler than Cryx Bane Base.
The same difference applies the other way round: Cryx Bane Base 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 Cryx Bane Base on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Cryx Bane Base equivalents · IJN Deep Dark Green equivalents