Pale Earth vs Sand Yellow RLM79

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Sand Yellow RLM79 is a little lighter, more saturated, warmer than Pale Earth.

Can I use Sand Yellow RLM79 instead of Pale Earth?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sand Yellow RLM79 is a little lighter, more saturated, warmer than Pale Earth.

Can I use Pale Earth instead of Sand Yellow RLM79?

The same difference applies the other way round: Pale Earth is a little darker, 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.