ΔE 12.7, fair: the same colour family, but not a straight swap. Sky Grey is a little lighter, more muted than Drake Tooth.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Sky Grey is a little lighter, more muted than Drake Tooth.
The same difference applies the other way round: Drake Tooth 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 Drake Tooth on the colour wheel See Sky Grey on the colour wheel
All matches: Drake Tooth equivalents · Sky Grey equivalents