ΔE 10.2, fair: the same colour family, but not a straight swap. Purple is a little darker, more saturated, warmer than Imperial Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Purple is a little darker, more saturated, warmer than Imperial Purple.
The same difference applies the other way round: Imperial Purple is a little lighter, more muted, 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 Imperial Purple on the colour wheel See Purple on the colour wheel
All matches: Imperial Purple equivalents · Purple equivalents