ΔE 113.4, loose: different enough that you should pick on purpose. Fluorescent Green is noticeably lighter, more muted, cooler than Orange Neon.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 113). Fluorescent Green is noticeably lighter, more muted, cooler than Orange Neon.
The same difference applies the other way round: Orange Neon is noticeably darker, 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 Orange Neon on the colour wheel See Fluorescent Green on the colour wheel
All matches: Orange Neon equivalents · Fluorescent Green equivalents