ΔE 45.2, loose: different enough that you should pick on purpose. Vomit is noticeably darker, much more muted, warmer than Yellow Fluor.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 45). Vomit is noticeably darker, much more muted, warmer than Yellow Fluor.
The same difference applies the other way round: Yellow Fluor is noticeably lighter, much 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 Yellow Fluor on the colour wheel See Vomit on the colour wheel
All matches: Yellow Fluor equivalents · Vomit equivalents