ΔE 10.8, fair: the same colour family, but not a straight swap. Teal is more saturated, warmer than Aethermatic Blue. They are different kinds of paint: Citadel Aethermatic Blue is a one-coat contrast-style paint and Golden Teal is an opaque base/layer 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 11). Teal is more saturated, warmer than Aethermatic Blue. They are different kinds of paint.
The same difference applies the other way round: Aethermatic Blue is more muted, 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 Aethermatic Blue on the colour wheel See Teal on the colour wheel
All matches: Aethermatic Blue equivalents · Teal equivalents