ΔE 62.9, loose: different enough that you should pick on purpose. Ink Violet is noticeably darker, much more muted, cooler than Quartz Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 63). Ink Violet is noticeably darker, much more muted, cooler than Quartz Magenta.
The same difference applies the other way round: Quartz Magenta is noticeably lighter, much more saturated, 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 Quartz Magenta on the colour wheel See Ink Violet on the colour wheel
All matches: Quartz Magenta equivalents · Ink Violet equivalents