ΔE 13.8, fair: the same colour family, but not a straight swap. Witch Purple is a little lighter, more saturated, cooler than Fuchsia.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Witch Purple is a little lighter, more saturated, cooler than Fuchsia.
The same difference applies the other way round: Fuchsia is a little darker, more muted, 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 Fuchsia on the colour wheel See Witch Purple on the colour wheel
All matches: Fuchsia equivalents · Witch Purple equivalents