ΔE 10.7, fair: the same colour family, but not a straight swap. True Blue is a little lighter, cooler than Caledor Sky.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). True Blue is a little lighter, cooler than Caledor Sky.
The same difference applies the other way round: Caledor Sky is a little darker, 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 Caledor Sky on the colour wheel See True Blue on the colour wheel
All matches: Caledor Sky equivalents · True Blue equivalents