ΔE 13.5, fair: the same colour family, but not a straight swap. Ink Violet is a little lighter, cooler than Purple Ink.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ink Violet is a little lighter, cooler than Purple Ink.
The same difference applies the other way round: Purple Ink is a little darker, 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 Purple Ink on the colour wheel See Ink Violet on the colour wheel
All matches: Purple Ink equivalents · Ink Violet equivalents