Arrakis Brown vs Sand Yellow

How close are they?

ΔE 15.3, loose: different enough that you should pick on purpose. Sand Yellow is a little lighter, more muted, cooler than Arrakis Brown.

Can I use Sand Yellow instead of Arrakis Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Sand Yellow is a little lighter, more muted, cooler than Arrakis Brown.

Can I use Arrakis Brown instead of Sand Yellow?

The same difference applies the other way round: Arrakis Brown is a little darker, 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.