ΔE 10.0, fair: the same colour family, but not a straight swap. German Red Brown is a little lighter, more saturated than Arbuckles Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). German Red Brown is a little lighter, more saturated than Arbuckles Brown.
The same difference applies the other way round: Arbuckles Brown is a little darker, 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.
See Arbuckles Brown on the colour wheel See German Red Brown on the colour wheel
All matches: Arbuckles Brown equivalents · German Red Brown equivalents