Clear Red vs Crimson

How close are they?

ΔE 21.2, loose: different enough that you should pick on purpose. Crimson is much more muted, warmer than Clear Red.

Can I use Crimson instead of Clear Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Crimson is much more muted, warmer than Clear Red.

Can I use Clear Red instead of Crimson?

The same difference applies the other way round: Clear Red is much 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.