Xereus Purple vs Spectral Purple

How close are they?

ΔE 23.6, loose: different enough that you should pick on purpose. Spectral Purple is noticeably lighter, more muted, warmer than Xereus Purple.

Can I use Spectral Purple instead of Xereus Purple?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Spectral Purple is noticeably lighter, more muted, warmer than Xereus Purple.

Can I use Xereus Purple instead of Spectral Purple?

The same difference applies the other way round: Xereus Purple is noticeably darker, more saturated, cooler.

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.