ΔE 49.9, loose: different enough that you should pick on purpose. Vomit is noticeably lighter, more muted, warmer than Fluor Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 50). Vomit is noticeably lighter, more muted, warmer than Fluor Red.
The same difference applies the other way round: Fluor Red is noticeably darker, 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 Fluor Red on the colour wheel See Vomit on the colour wheel
All matches: Fluor Red equivalents · Vomit equivalents