ΔE 16.2, loose: different enough that you should pick on purpose. Teal is noticeably lighter, more saturated than Nighthaunt Gloom. They are different kinds of paint: Citadel Nighthaunt Gloom is a one-coat contrast-style paint and Golden Teal is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Teal is noticeably lighter, more saturated than Nighthaunt Gloom. They are different kinds of paint.
The same difference applies the other way round: Nighthaunt Gloom is noticeably 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 Nighthaunt Gloom on the colour wheel See Teal on the colour wheel
All matches: Nighthaunt Gloom equivalents · Teal equivalents