ΔE 26.7, loose: different enough that you should pick on purpose. Fluorescent Magenta is noticeably darker, much more saturated than Fluorescent Pink.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Fluorescent Magenta is noticeably darker, much more saturated than Fluorescent Pink.
The same difference applies the other way round: Fluorescent 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 Fluorescent Pink on the colour wheel See Fluorescent Magenta on the colour wheel
All matches: Fluorescent Pink equivalents · Fluorescent Magenta equivalents