ΔE 13.4, fair: the same colour family, but not a straight swap. Umberroot is noticeably lighter, more muted, warmer than RAL 8013 Rotbraun.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Umberroot is noticeably lighter, more muted, warmer than RAL 8013 Rotbraun.
The same difference applies the other way round: RAL 8013 Rotbraun is noticeably darker, more saturated, 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.
See RAL 8013 Rotbraun on the colour wheel See Umberroot on the colour wheel
All matches: RAL 8013 Rotbraun equivalents · Umberroot equivalents