ΔE 7.1, close: similar, with a visible difference side by side. IJN Dk Black Green is a little darker than Obsidian Skin.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). IJN Dk Black Green is a little darker than Obsidian Skin.
The same difference applies the other way round: Obsidian Skin is a little lighter.
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 Obsidian Skin on the colour wheel See IJN Dk Black Green on the colour wheel
All matches: Obsidian Skin equivalents · IJN Dk Black Green equivalents