ΔE 28.5, loose: different enough that you should pick on purpose. Witch Purple is noticeably darker, much more saturated than Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Witch Purple is noticeably darker, much more saturated than Pink.
The same difference applies the other way round: Pink is noticeably lighter, much more muted.
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 Pink on the colour wheel See Witch Purple on the colour wheel
All matches: Pink equivalents · Witch Purple equivalents