Fluor Lime vs Moss and Lichen

How close are they?

ΔE 31.8, loose: different enough that you should pick on purpose. Moss and Lichen is noticeably lighter, more saturated, warmer than Fluor Lime.

Can I use Moss and Lichen instead of Fluor Lime?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 32). Moss and Lichen is noticeably lighter, more saturated, warmer than Fluor Lime.

Can I use Fluor Lime instead of Moss and Lichen?

The same difference applies the other way round: Fluor Lime is noticeably darker, more muted, 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.