ΔE 6.4, close: similar, with a visible difference side by side. Umberroot is a little lighter, warmer than Dark Shadow Flesh.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Umberroot is a little lighter, warmer than Dark Shadow Flesh.
The same difference applies the other way round: Dark Shadow Flesh is a little darker, 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 Dark Shadow Flesh on the colour wheel See Umberroot on the colour wheel
All matches: Dark Shadow Flesh equivalents · Umberroot equivalents