ΔE 15.4, loose: different enough that you should pick on purpose. Dry Blood is a little darker, cooler than Dark Rust.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Dry Blood is a little darker, cooler than Dark Rust.
The same difference applies the other way round: Dark Rust is a little lighter, 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 Dark Rust on the colour wheel See Dry Blood on the colour wheel
All matches: Dark Rust equivalents · Dry Blood equivalents