ΔE 10.4, fair: the same colour family, but not a straight swap. Sand is a little darker, more saturated than Graphite.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Sand is a little darker, more saturated than Graphite.
The same difference applies the other way round: Graphite is a little 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 Graphite on the colour wheel See Sand on the colour wheel
All matches: Graphite equivalents · Sand equivalents