ΔE 9.6, close: similar, with a visible difference side by side. Chalice Red is more saturated, cooler than Ruddy Leather.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Chalice Red is more saturated, cooler than Ruddy Leather.
The same difference applies the other way round: Ruddy Leather is 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 Ruddy Leather on the colour wheel See Chalice Red on the colour wheel
All matches: Ruddy Leather equivalents · Chalice Red equivalents