ΔE 16.5, loose: different enough that you should pick on purpose. Magenta Blood is a little lighter, cooler than C.P. Cadmium Red Medium.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Magenta Blood is a little lighter, cooler than C.P. Cadmium Red Medium.
The same difference applies the other way round: C.P. Cadmium Red Medium 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 C.P. Cadmium Red Medium on the colour wheel See Magenta Blood on the colour wheel
All matches: C.P. Cadmium Red Medium equivalents · Magenta Blood equivalents