ΔE 9.2, close: similar, with a visible difference side by side. IJN Black Green is a little lighter, more saturated than Doom Death Black.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). IJN Black Green is a little lighter, more saturated than Doom Death Black.
The same difference applies the other way round: Doom Death Black 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 Doom Death Black on the colour wheel See IJN Black Green on the colour wheel
All matches: Doom Death Black equivalents · IJN Black Green equivalents