ΔE 14.5, fair: the same colour family, but not a straight swap. Magenta Blood is noticeably lighter, cooler than Primary Magenta.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Magenta Blood is noticeably lighter, cooler than Primary Magenta.
The same difference applies the other way round: Primary Magenta is noticeably 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 Primary Magenta on the colour wheel See Magenta Blood on the colour wheel
All matches: Primary Magenta equivalents · Magenta Blood equivalents