RAL 8031 F9 Sandbraun vs Sand Yellow RLM79

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Sand Yellow RLM79 is a little lighter, more muted than RAL 8031 F9 Sandbraun.

Can I use Sand Yellow RLM79 instead of RAL 8031 F9 Sandbraun?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Sand Yellow RLM79 is a little lighter, more muted than RAL 8031 F9 Sandbraun.

Can I use RAL 8031 F9 Sandbraun instead of Sand Yellow RLM79?

The same difference applies the other way round: RAL 8031 F9 Sandbraun is a little darker, more saturated.

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.