ΔE 14.5, fair: the same colour family, but not a straight swap. Sky Blue is noticeably lighter than Granite Stone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Sky Blue is noticeably lighter than Granite Stone.
The same difference applies the other way round: Granite Stone is noticeably 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 Granite Stone on the colour wheel See Sky Blue on the colour wheel
All matches: Granite Stone equivalents · Sky Blue equivalents