ΔE 13.1, fair: the same colour family, but not a straight swap. Light Violet is noticeably lighter than Alien Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Light Violet is noticeably lighter than Alien Purple.
The same difference applies the other way round: Alien Purple is noticeably darker.
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 Alien Purple on the colour wheel See Light Violet on the colour wheel
All matches: Alien Purple equivalents · Light Violet equivalents