ΔE 13.0, fair: the same colour family, but not a straight swap. Teal is a little lighter, more saturated, cooler than Nihilakh Oxide. They are different kinds of paint: Citadel Nihilakh Oxide is a technical paint or medium 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.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Teal is a little lighter, more saturated, cooler than Nihilakh Oxide. They are different kinds of paint.
The same difference applies the other way round: Nihilakh Oxide is a little darker, more muted, warmer.
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 Nihilakh Oxide on the colour wheel See Teal on the colour wheel
All matches: Nihilakh Oxide equivalents · Teal equivalents