ΔE 14.5, fair: the same colour family, but not a straight swap. Sky Blue is noticeably darker, more saturated than White Star.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Sky Blue is noticeably darker, more saturated than White Star.
The same difference applies the other way round: White Star is noticeably lighter, more muted.
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 White Star on the colour wheel See Sky Blue on the colour wheel
All matches: White Star equivalents · Sky Blue equivalents