ΔE 13.7, fair: the same colour family, but not a straight swap. Glacier Blue is a little lighter than Ion Blue.
✓ Two Thin Coats comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Glacier Blue is a little lighter than Ion Blue.
The same difference applies the other way round: Ion Blue is a little darker.
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 Ion Blue on the colour wheel See Glacier Blue on the colour wheel
All matches: Ion Blue equivalents · Glacier Blue equivalents