ΔE 6.6, close: similar, with a visible difference side by side. Cuirass Leather is a little darker, more muted than Ashroot.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Cuirass Leather is a little darker, more muted than Ashroot.
The same difference applies the other way round: Ashroot is a little lighter, more saturated.
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 Ashroot on the colour wheel See Cuirass Leather on the colour wheel
All matches: Ashroot equivalents · Cuirass Leather equivalents