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