Blood for the Blood God vs Matt Varnish

How close are they?

ΔE 82.3, loose: different enough that you should pick on purpose. Matt Varnish is noticeably lighter, much more muted than Blood for the Blood God.

Can I use Matt Varnish instead of Blood for the Blood God?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 82). Matt Varnish is noticeably lighter, much more muted than Blood for the Blood God.

Can I use Blood for the Blood God instead of Matt Varnish?

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.