ΔE 18.9, loose: different enough that you should pick on purpose. Sky Grey is noticeably darker, more muted than Pale Sand.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Sky Grey is noticeably darker, more muted than Pale Sand.
The same difference applies the other way round: Pale Sand is noticeably lighter, more saturated.
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 Pale Sand on the colour wheel See Sky Grey on the colour wheel
All matches: Pale Sand equivalents · Sky Grey equivalents