Neon Yellow vs Moss and Lichen

How close are they?

ΔE 23.7, loose: different enough that you should pick on purpose. Moss and Lichen is a little darker, much more muted, cooler than Neon Yellow.

Can I use Moss and Lichen instead of Neon Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Moss and Lichen is a little darker, much more muted, cooler than Neon Yellow.

Can I use Neon Yellow instead of Moss and Lichen?

The same difference applies the other way round: Neon Yellow is a little lighter, 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.