ΔE 11.6, fair: the same colour family, but not a straight swap. Azurite Hue is more muted, cooler than Celestium Blue. They are different kinds of paint: Citadel Celestium Blue is a one-coat contrast-style paint and Golden Azurite Hue 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 12). Azurite Hue is more muted, cooler than Celestium Blue. They are different kinds of paint.
The same difference applies the other way round: Celestium Blue is more saturated, 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 Celestium Blue on the colour wheel See Azurite Hue on the colour wheel
All matches: Celestium Blue equivalents · Azurite Hue equivalents