ΔE 21.4, loose: different enough that you should pick on purpose. Sapphire Blue is noticeably darker, cooler than Cultist Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Sapphire Blue is noticeably darker, cooler than Cultist Purple.
The same difference applies the other way round: Cultist 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 Cultist Purple on the colour wheel See Sapphire Blue on the colour wheel
All matches: Cultist Purple equivalents · Sapphire Blue equivalents