Yellow Dune vs Meaty Ochre

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Meaty Ochre is noticeably darker, more saturated, warmer than Yellow Dune.

Can I use Meaty Ochre instead of Yellow Dune?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Meaty Ochre is noticeably darker, more saturated, warmer than Yellow Dune.

Can I use Yellow Dune instead of Meaty Ochre?

The same difference applies the other way round: Yellow Dune is noticeably lighter, more muted, 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.