ΔE 10.5, fair: the same colour family, but not a straight swap. Light Violet is a little darker, warmer than Lavender.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Light Violet is a little darker, warmer than Lavender.
The same difference applies the other way round: Lavender is a little 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 Lavender on the colour wheel See Light Violet on the colour wheel
All matches: Lavender equivalents · Light Violet equivalents