ΔE 11.7, fair: the same colour family, but not a straight swap. Bloody Red is a little lighter, cooler than Pyrrole Red Dark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Bloody Red is a little lighter, cooler than Pyrrole Red Dark.
The same difference applies the other way round: Pyrrole Red Dark is a little darker, 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 Pyrrole Red Dark on the colour wheel See Bloody Red on the colour wheel
All matches: Pyrrole Red Dark equivalents · Bloody Red equivalents