Cadmium Red vs Bright Orange

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Bright Orange is a little darker than Cadmium Red.

Can I use Bright Orange instead of Cadmium Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Bright Orange is a little darker than Cadmium Red.

Can I use Cadmium Red instead of Bright Orange?

The same difference applies the other way round: Cadmium Red 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.