Angron Red Clear vs Carnage Red

How close are they?

ΔE 23.0, loose: different enough that you should pick on purpose. Carnage Red is noticeably darker, much more muted than Angron Red Clear.

Can I use Carnage Red instead of Angron Red Clear?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Carnage Red is noticeably darker, much more muted than Angron Red Clear.

Can I use Angron Red Clear instead of Carnage Red?

The same difference applies the other way round: Angron Red Clear is noticeably lighter, much 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.