Cherry Red vs Scarlet

How close are they?

ΔE 24.4, loose: different enough that you should pick on purpose. Scarlet is more muted, warmer than Cherry Red.

Can I use Scarlet instead of Cherry Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Scarlet is more muted, warmer than Cherry Red.

Can I use Cherry Red instead of Scarlet?

The same difference applies the other way round: Cherry Red is more saturated, 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.