ΔE 11.9, fair: the same colour family, but not a straight swap. Azure is a little lighter, warmer than Power Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Azure is a little lighter, warmer than Power Blue.
The same difference applies the other way round: Power Blue is a little darker, 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 Power Blue on the colour wheel See Azure on the colour wheel
All matches: Power Blue equivalents · Azure equivalents