ΔE 15.7, loose: different enough that you should pick on purpose. Moldy Wine is more saturated, cooler than Umber Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Moldy Wine is more saturated, cooler than Umber Brown.
The same difference applies the other way round: Umber Brown is more muted, 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 Umber Brown on the colour wheel See Moldy Wine on the colour wheel
All matches: Umber Brown equivalents · Moldy Wine equivalents