Impish Rouge vs Spectral Purple

How close are they?

ΔE 29.8, loose: different enough that you should pick on purpose. Spectral Purple is a little darker, much more muted, cooler than Impish Rouge.

Can I use Spectral Purple instead of Impish Rouge?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Spectral Purple is a little darker, much more muted, cooler than Impish Rouge.

Can I use Impish Rouge instead of Spectral Purple?

The same difference applies the other way round: Impish Rouge 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.