ΔE 16.9, loose: different enough that you should pick on purpose. Pink Horror is noticeably lighter, warmer than Warlock Purple.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Pink Horror is noticeably lighter, warmer than Warlock Purple.
The same difference applies the other way round: Warlock Purple is noticeably darker, 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 Pink Horror on the colour wheel
All matches: Warlock Purple equivalents · Pink Horror equivalents