ΔE 28.5, loose: different enough that you should pick on purpose. Red Flesh is a little lighter, much more muted, warmer than Blood Chalice.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Red Flesh is a little lighter, much more muted, warmer than Blood Chalice.
The same difference applies the other way round: Blood Chalice is a little darker, much more saturated, 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 Blood Chalice on the colour wheel See Red Flesh on the colour wheel
All matches: Blood Chalice equivalents · Red Flesh equivalents