ΔE 12.0, fair: the same colour family, but not a straight swap. Magic Blue is a little darker, warmer than Blue Flux.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Magic Blue is a little darker, warmer than Blue Flux.
The same difference applies the other way round: Blue Flux 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 Blue Flux on the colour wheel See Magic Blue on the colour wheel
All matches: Blue Flux equivalents · Magic Blue equivalents