Sandgelb RLM 79 vs Fiendish Yellow

How close are they?

ΔE 12.9, fair: the same colour family, but not a straight swap. Fiendish Yellow is much more saturated than Sandgelb RLM 79.

Can I use Fiendish Yellow instead of Sandgelb RLM 79?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Fiendish Yellow is much more saturated than Sandgelb RLM 79.

Can I use Sandgelb RLM 79 instead of Fiendish Yellow?

The same difference applies the other way round: Sandgelb RLM 79 is much more muted.

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.