ΔE 11.1, fair: the same colour family, but not a straight swap. Scarlet Blood is more saturated, warmer than Crimson.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Scarlet Blood is more saturated, warmer than Crimson.
The same difference applies the other way round: Crimson is more muted, 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 Crimson on the colour wheel See Scarlet Blood on the colour wheel
All matches: Crimson equivalents · Scarlet Blood equivalents