ΔE 10.0, fair: the same colour family, but not a straight swap. Dark Vermilion is cooler than Rotbraun RAL 8012.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Vermilion is cooler than Rotbraun RAL 8012.
The same difference applies the other way round: Rotbraun RAL 8012 is 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.
See Rotbraun RAL 8012 on the colour wheel See Dark Vermilion on the colour wheel
All matches: Rotbraun RAL 8012 equivalents · Dark Vermilion equivalents