ΔE 16.8, loose: different enough that you should pick on purpose. Blood Angels Red is a little lighter, much more saturated, warmer than Slaughter Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Blood Angels Red is a little lighter, much more saturated, warmer than Slaughter Red.
The same difference applies the other way round: Slaughter Red is a little darker, much 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 Slaughter Red on the colour wheel See Blood Angels Red on the colour wheel
All matches: Slaughter Red equivalents · Blood Angels Red equivalents