ΔE 9.2, close: similar, with a visible difference side by side. Dark Purple is a little darker, more saturated, cooler than Cinder Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Purple is a little darker, more saturated, cooler than Cinder Brown.
The same difference applies the other way round: Cinder Brown is a little lighter, 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 Cinder Brown on the colour wheel See Dark Purple on the colour wheel
All matches: Cinder Brown equivalents · Dark Purple equivalents