ΔE 11.6, fair: the same colour family, but not a straight swap. Violet Vamp is a little darker, more saturated than Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Violet Vamp is a little darker, more saturated than Purple.
The same difference applies the other way round: Purple is a little lighter, more muted.
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 Purple on the colour wheel See Violet Vamp on the colour wheel
All matches: Purple equivalents · Violet Vamp equivalents