ΔE 23.5, loose: different enough that you should pick on purpose. Acid is much more muted, cooler than Green Fluor.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Acid is much more muted, cooler than Green Fluor.
The same difference applies the other way round: Green Fluor is much more saturated, 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 Green Fluor on the colour wheel See Acid on the colour wheel
All matches: Green Fluor equivalents · Acid equivalents