ΔE 52.9, loose: different enough that you should pick on purpose. Moss and Lichen is noticeably lighter, warmer than Fluorescent Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 53). Moss and Lichen is noticeably lighter, warmer than Fluorescent Green.
The same difference applies the other way round: Fluorescent Green is noticeably darker, 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 Fluorescent Green on the colour wheel See Moss and Lichen on the colour wheel
All matches: Fluorescent Green equivalents · Moss and Lichen equivalents