Demigod Flames vs Blood Tracker Brown

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Blood Tracker Brown is noticeably darker, more muted than Demigod Flames.

Can I use Blood Tracker Brown instead of Demigod Flames?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Blood Tracker Brown is noticeably darker, more muted than Demigod Flames.

Can I use Demigod Flames instead of Blood Tracker Brown?

The same difference applies the other way round: Demigod Flames is noticeably lighter, 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.