ΔE 9.7, close: similar, with a visible difference side by side. IJN Deep Dark Green is a little lighter than Ocean Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). IJN Deep Dark Green is a little lighter than Ocean Blue.
The same difference applies the other way round: Ocean Blue is a little darker.
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 Ocean Blue on the colour wheel See IJN Deep Dark Green on the colour wheel
All matches: Ocean Blue equivalents · IJN Deep Dark Green equivalents