ΔE 29.1, loose: different enough that you should pick on purpose. Scarlet Blood is a little darker, much more saturated than Sekigahara.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Scarlet Blood is a little darker, much more saturated than Sekigahara.
The same difference applies the other way round: Sekigahara is a little lighter, much more muted.
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 Sekigahara on the colour wheel See Scarlet Blood on the colour wheel
All matches: Sekigahara equivalents · Scarlet Blood equivalents