ΔE 13.6, fair: the same colour family, but not a straight swap. Magic Blue is noticeably lighter, cooler than Crystal Blue.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Magic Blue is noticeably lighter, cooler than Crystal Blue.
The same difference applies the other way round: Crystal Blue is noticeably darker, 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 Crystal Blue on the colour wheel See Magic Blue on the colour wheel
All matches: Crystal Blue equivalents · Magic Blue equivalents