Flame Orange vs Demigod Flames

How close are they?

ΔE 8.3, close: similar, with a visible difference side by side. Demigod Flames is a little darker than Flame Orange.

Can I use Demigod Flames instead of Flame Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Demigod Flames is a little darker than Flame Orange.

Can I use Flame Orange instead of Demigod Flames?

The same difference applies the other way round: Flame Orange is a little lighter.

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.