ΔE 11.1, fair: the same colour family, but not a straight swap. Imperial Purple is a little darker, cooler than Violet Volt.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Imperial Purple is a little darker, cooler than Violet Volt.
The same difference applies the other way round: Violet Volt is a little lighter, 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 Violet Volt on the colour wheel See Imperial Purple on the colour wheel
All matches: Violet Volt equivalents · Imperial Purple equivalents