ΔE 5.8, very close: most people won’t see a difference side by side. UK Azure Blue is a little darker, warmer than Celestial Blue.
Yes, for most jobs. Very close match (ΔE 6). UK Azure Blue is a little darker, warmer than Celestial Blue.
The same difference applies the other way round: Celestial Blue is a little lighter, 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 Celestial Blue on the colour wheel See UK Azure Blue on the colour wheel
All matches: Celestial Blue equivalents · UK Azure Blue equivalents