Enchanted Pink vs Purple Rain

How close are they?

ΔE 33.3, loose: different enough that you should pick on purpose. Purple Rain is noticeably darker, cooler than Enchanted Pink.

Can I use Purple Rain instead of Enchanted Pink?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Purple Rain is noticeably darker, cooler than Enchanted Pink.

Can I use Enchanted Pink instead of Purple Rain?

The same difference applies the other way round: Enchanted Pink is noticeably lighter, 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.