Chaotic Red vs Dread Red

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Dread Red is more saturated, warmer than Chaotic Red.

Can I use Dread Red instead of Chaotic Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dread Red is more saturated, warmer than Chaotic Red.

Can I use Chaotic Red instead of Dread Red?

The same difference applies the other way round: Chaotic Red is more muted, cooler.

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.