ΔE 13.1, fair: the same colour family, but not a straight swap. Indigo Sky is more muted, warmer than Caledor Sky.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Indigo Sky is more muted, warmer than Caledor Sky.
The same difference applies the other way round: Caledor Sky is 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.
See Caledor Sky on the colour wheel See Indigo Sky on the colour wheel
All matches: Caledor Sky equivalents · Indigo Sky equivalents