ΔE 9.7, close: similar, with a visible difference side by side. Burnt Sienna Umber is a little darker, more muted, warmer than Dark Battle Dress.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Burnt Sienna Umber is a little darker, more muted, warmer than Dark Battle Dress.
The same difference applies the other way round: Dark Battle Dress 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 Dark Battle Dress on the colour wheel See Burnt Sienna Umber on the colour wheel
All matches: Dark Battle Dress equivalents · Burnt Sienna Umber equivalents