Angron Red Clear vs Demon Red

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Demon Red is more saturated than Angron Red Clear.

Can I use Demon Red instead of Angron Red Clear?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Demon Red is more saturated than Angron Red Clear.

Can I use Angron Red Clear instead of Demon Red?

The same difference applies the other way round: Angron Red Clear is more muted.

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.