ΔE 13.3, fair: the same colour family, but not a straight swap. Red Brown is a little darker, more muted, warmer than Moldy Wine.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Red Brown is a little darker, more muted, warmer than Moldy Wine.
The same difference applies the other way round: Moldy Wine is a little lighter, 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 Moldy Wine on the colour wheel See Red Brown on the colour wheel
All matches: Moldy Wine equivalents · Red Brown equivalents