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