Light Red vs Worn Red

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Worn Red is more muted, cooler than Light Red.

Can I use Worn Red instead of Light Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Worn Red is more muted, cooler than Light Red.

Can I use Light Red instead of Worn Red?

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

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.