ΔE 13.3, fair: the same colour family, but not a straight swap. Magic Blue is a little darker, warmer than Primary Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Magic Blue is a little darker, warmer than Primary Blue.
The same difference applies the other way round: Primary 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 Primary Blue on the colour wheel See Magic Blue on the colour wheel
All matches: Primary Blue equivalents · Magic Blue equivalents