ΔE 52.3, loose: different enough that you should pick on purpose. Fluorescent Magenta is much more saturated, warmer than Fluor Violet.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 52). Fluorescent Magenta is much more saturated, warmer than Fluor Violet.
The same difference applies the other way round: Fluor Violet is much more muted, 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 Fluor Violet on the colour wheel See Fluorescent Magenta on the colour wheel
All matches: Fluor Violet equivalents · Fluorescent Magenta equivalents