ΔE 10.6, fair: the same colour family, but not a straight swap. Andrea Blue is a little lighter, more muted, cooler than Pure Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Andrea Blue is a little lighter, more muted, cooler than Pure Blue.
The same difference applies the other way round: Pure Blue is a little darker, more saturated, warmer.
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 Pure Blue on the colour wheel See Andrea Blue on the colour wheel
All matches: Pure Blue equivalents · Andrea Blue equivalents