ΔE 35.6, loose: different enough that you should pick on purpose. Sanguine Highlight is noticeably lighter, much more saturated, warmer than Warlock Purple.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 36). Sanguine Highlight is noticeably lighter, much more saturated, warmer than Warlock Purple.
The same difference applies the other way round: Warlock Purple is noticeably darker, much more muted, 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 Warlock Purple on the colour wheel See Sanguine Highlight on the colour wheel
All matches: Warlock Purple equivalents · Sanguine Highlight equivalents