ΔE 9.3, close: similar, with a visible difference side by side. Dark Rose is a little darker, more saturated, cooler than Ashen Brown.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dark Rose is a little darker, more saturated, cooler than Ashen Brown.
The same difference applies the other way round: Ashen 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 Ashen Brown on the colour wheel See Dark Rose on the colour wheel
All matches: Ashen Brown equivalents · Dark Rose equivalents