ΔE 13.4, fair: the same colour family, but not a straight swap. Blue is more saturated, warmer than Blue Black.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Blue is more saturated, warmer than Blue Black.
The same difference applies the other way round: Blue Black is 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 Blue Black on the colour wheel See Blue on the colour wheel
All matches: Blue Black equivalents · Blue equivalents