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