ΔE 37.4, loose: different enough that you should pick on purpose. Fluorescent Magenta is more muted, warmer than Fluorescent Violet.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Fluorescent Magenta is more muted, warmer than Fluorescent Violet.
The same difference applies the other way round: Fluorescent Violet is more saturated, 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 Fluorescent Violet on the colour wheel See Fluorescent Magenta on the colour wheel
All matches: Fluorescent Violet equivalents · Fluorescent Magenta equivalents