ΔE 13.5, fair: the same colour family, but not a straight swap. RLM 23 Red is a little darker, cooler than Blood Chalice.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). RLM 23 Red is a little darker, cooler than Blood Chalice.
The same difference applies the other way round: Blood Chalice 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 Blood Chalice on the colour wheel See RLM 23 Red on the colour wheel
All matches: Blood Chalice equivalents · RLM 23 Red equivalents