ΔE 13.7, fair: the same colour family, but not a straight swap. Glacier Blue is noticeably lighter, more muted, cooler than Decadent Purple.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Glacier Blue is noticeably lighter, more muted, cooler than Decadent Purple.
The same difference applies the other way round: Decadent Purple is noticeably darker, 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.
See Decadent Purple on the colour wheel See Glacier Blue on the colour wheel
All matches: Decadent Purple equivalents · Glacier Blue equivalents