ΔE 9.7, close: similar, with a visible difference side by side. Charred Brown is a little lighter, more saturated, cooler than Dark Umber.
✓ Herrick Games paint comparison chart lists these two as equivalents.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Charred Brown is a little lighter, more saturated, cooler than Dark Umber.
The same difference applies the other way round: Dark Umber is a little darker, 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 Dark Umber on the colour wheel See Charred Brown on the colour wheel
All matches: Dark Umber equivalents · Charred Brown equivalents