ΔE 14.4, fair: the same colour family, but not a straight swap. Sky Grey is a little lighter, more muted than Gargoyle Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Sky Grey is a little lighter, more muted than Gargoyle Grey.
The same difference applies the other way round: Gargoyle Grey is a little darker, 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 Gargoyle Grey on the colour wheel See Sky Grey on the colour wheel
All matches: Gargoyle Grey equivalents · Sky Grey equivalents