ΔE 21.4, loose: different enough that you should pick on purpose. Green Shark Skin is noticeably darker, warmer than Nighthaunt Gloom.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Green Shark Skin is noticeably darker, warmer than Nighthaunt Gloom.
The same difference applies the other way round: Nighthaunt Gloom is noticeably lighter, cooler.
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 Nighthaunt Gloom on the colour wheel See Green Shark Skin on the colour wheel
All matches: Nighthaunt Gloom equivalents · Green Shark Skin equivalents