Ember Orange vs Inferno Red

How close are they?

ΔE 9.9, close: similar, with a visible difference side by side. Inferno Red is more muted than Ember Orange.

Can I use Inferno Red instead of Ember Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Inferno Red is more muted than Ember Orange.

Can I use Ember Orange instead of Inferno Red?

The same difference applies the other way round: Ember Orange is 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.