Fire Red vs Flat Red

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Flat Red is a little darker, more muted than Fire Red.

Can I use Flat Red instead of Fire Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Flat Red is a little darker, more muted than Fire Red.

Can I use Fire Red instead of Flat Red?

The same difference applies the other way round: Fire Red is a little 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.