ΔE 10.8, fair: the same colour family, but not a straight swap. UK Azure Blue is more saturated, warmer than Stormfang.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). UK Azure Blue is more saturated, warmer than Stormfang.
The same difference applies the other way round: Stormfang 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 Stormfang on the colour wheel See UK Azure Blue on the colour wheel
All matches: Stormfang equivalents · UK Azure Blue equivalents