Pink Potion vs Decadent Purple

How close are they?

ΔE 21.0, loose: different enough that you should pick on purpose. Decadent Purple is a little darker, much more muted, cooler than Pink Potion.

Can I use Decadent Purple instead of Pink Potion?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Decadent Purple is a little darker, much more muted, cooler than Pink Potion.

Can I use Pink Potion instead of Decadent Purple?

The same difference applies the other way round: Pink Potion is a little lighter, much 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.