Evil Sunz Scarlet vs Carnage Red

How close are they?

ΔE 20.7, loose: different enough that you should pick on purpose. Carnage Red is a little darker, much more muted than Evil Sunz Scarlet.

Can I use Carnage Red instead of Evil Sunz Scarlet?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Carnage Red is a little darker, much more muted than Evil Sunz Scarlet.

Can I use Evil Sunz Scarlet instead of Carnage Red?

The same difference applies the other way round: Evil Sunz Scarlet is a little 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.