Reddish Orange vs Worn Red

How close are they?

ΔE 18.1, loose: different enough that you should pick on purpose. Worn Red is noticeably lighter, cooler than Reddish Orange.

Can I use Worn Red instead of Reddish Orange?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Worn Red is noticeably lighter, cooler than Reddish Orange.

Can I use Reddish Orange instead of Worn Red?

The same difference applies the other way round: Reddish Orange 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.