Maize Yellow vs Warm Yellow

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Warm Yellow is a little darker, more muted, warmer than Maize Yellow.

Can I use Warm Yellow instead of Maize Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Warm Yellow is a little darker, more muted, warmer than Maize Yellow.

Can I use Maize Yellow instead of Warm Yellow?

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