ΔE 54.1, loose: different enough that you should pick on purpose. Fluorescent Violet is noticeably darker, much more muted, cooler than Acid Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 54). Fluorescent Violet is noticeably darker, much more muted, cooler than Acid Pink.
The same difference applies the other way round: Acid Pink is noticeably lighter, much more saturated, 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 Acid Pink on the colour wheel See Fluorescent Violet on the colour wheel
All matches: Acid Pink equivalents · Fluorescent Violet equivalents