Sulfuric Yellow vs Sand Yellow

How close are they?

ΔE 22.4, loose: different enough that you should pick on purpose. Sand Yellow is a little darker, much more muted, warmer than Sulfuric Yellow.

Can I use Sand Yellow instead of Sulfuric Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Sand Yellow is a little darker, much more muted, warmer than Sulfuric Yellow.

Can I use Sulfuric Yellow instead of Sand Yellow?

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