ΔE 82.0, loose: different enough that you should pick on purpose. Satin Varnish is noticeably lighter, much more muted than Blood for the Blood God.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 82). Satin Varnish is noticeably lighter, much more muted than Blood for the Blood God.
The same difference applies the other way round: Blood for the Blood God is noticeably darker, much more saturated.
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 Blood for the Blood God on the colour wheel See Satin Varnish on the colour wheel
All matches: Blood for the Blood God equivalents · Satin Varnish equivalents