Canopy Green vs Lemon Yellow

How close are they?

ΔE 26.1, loose: different enough that you should pick on purpose. Lemon Yellow is noticeably lighter, more muted, warmer than Canopy Green.

Can I use Lemon Yellow instead of Canopy Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Lemon Yellow is noticeably lighter, more muted, warmer than Canopy Green.

Can I use Canopy Green instead of Lemon Yellow?

The same difference applies the other way round: Canopy Green is noticeably darker, more saturated, 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.