ΔE 11.4, fair: the same colour family, but not a straight swap. UK Azure Blue is a little lighter, more muted than Medium 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 muted than Medium Blue.
The same difference applies the other way round: Medium Blue is a little darker, more saturated.
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 Medium Blue on the colour wheel See UK Azure Blue on the colour wheel
All matches: Medium Blue equivalents · UK Azure Blue equivalents