ΔE 46.6, loose: different enough that you should pick on purpose. Fluorescent Orange is noticeably darker, much more saturated, cooler than Fluor Yellow-Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Fluorescent Orange is noticeably darker, much more saturated, cooler than Fluor Yellow-Orange.
The same difference applies the other way round: Fluor Yellow-Orange is noticeably lighter, much more muted, 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 Fluor Yellow-Orange on the colour wheel See Fluorescent Orange on the colour wheel
All matches: Fluor Yellow-Orange equivalents · Fluorescent Orange equivalents