ΔE 26.5, loose: different enough that you should pick on purpose. Anthraquinone Blue is noticeably darker, cooler than Genestealer Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Anthraquinone Blue is noticeably darker, cooler than Genestealer Purple.
The same difference applies the other way round: Genestealer Purple is noticeably lighter, 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 Genestealer Purple on the colour wheel See Anthraquinone Blue on the colour wheel
All matches: Genestealer Purple equivalents · Anthraquinone Blue equivalents