ΔE 12.5, fair: the same colour family, but not a straight swap. Umber Wash is noticeably lighter than Andalusian Earth.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Umber Wash is noticeably lighter than Andalusian Earth.
The same difference applies the other way round: Andalusian Earth is noticeably darker.
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 Andalusian Earth on the colour wheel See Umber Wash on the colour wheel
All matches: Andalusian Earth equivalents · Umber Wash equivalents