ΔE 11.3, fair: the same colour family, but not a straight swap. UK Azure Blue is a little lighter, more saturated, warmer than Weathered Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). UK Azure Blue is a little lighter, more saturated, warmer than Weathered Blue.
The same difference applies the other way round: Weathered Blue is a little darker, 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 Weathered Blue on the colour wheel See UK Azure Blue on the colour wheel
All matches: Weathered Blue equivalents · UK Azure Blue equivalents