Phoenix Red vs Worn Red

How close are they?

ΔE 29.8, loose: different enough that you should pick on purpose. Worn Red is noticeably lighter, cooler than Phoenix Red.

Can I use Worn Red instead of Phoenix Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Worn Red is noticeably lighter, cooler than Phoenix Red.

Can I use Phoenix Red instead of Worn Red?

The same difference applies the other way round: Phoenix Red is noticeably darker, 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.