Chaotic Red vs Sanguine Base

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Sanguine Base is cooler than Chaotic Red.

Can I use Sanguine Base instead of Chaotic Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Sanguine Base is cooler than Chaotic Red.

Can I use Chaotic Red instead of Sanguine Base?

The same difference applies the other way round: Chaotic Red is warmer.

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.