ΔE 14.8, fair: the same colour family, but not a straight swap. Spellbound Fuchsia is noticeably darker, warmer than Light Plum.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Spellbound Fuchsia is noticeably darker, warmer than Light Plum.
The same difference applies the other way round: Light Plum is noticeably 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 Light Plum on the colour wheel See Spellbound Fuchsia on the colour wheel
All matches: Light Plum equivalents · Spellbound Fuchsia equivalents