ΔE 12.3, fair: the same colour family, but not a straight swap. Medium Magenta is a little lighter, more saturated, warmer than Spellbound Fuchsia.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Medium Magenta is a little lighter, more saturated, warmer than Spellbound Fuchsia.
The same difference applies the other way round: Spellbound Fuchsia is a little darker, 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 Spellbound Fuchsia on the colour wheel See Medium Magenta on the colour wheel
All matches: Spellbound Fuchsia equivalents · Medium Magenta equivalents