ΔE 20.4, loose: different enough that you should pick on purpose. Ink Violet is noticeably lighter, much more muted, warmer than Anthraquinone Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Ink Violet is noticeably lighter, much more muted, warmer than Anthraquinone Blue.
The same difference applies the other way round: Anthraquinone Blue is noticeably darker, much more saturated, 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 Anthraquinone Blue on the colour wheel See Ink Violet on the colour wheel
All matches: Anthraquinone Blue equivalents · Ink Violet equivalents