Yellow Sand vs Ivory RLM05

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Ivory RLM05 is a little lighter, more saturated, cooler than Yellow Sand.

Can I use Ivory RLM05 instead of Yellow Sand?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Ivory RLM05 is a little lighter, more saturated, cooler than Yellow Sand.

Can I use Yellow Sand instead of Ivory RLM05?

The same difference applies the other way round: Yellow Sand is a little darker, more muted, 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.