ΔE 10.5, fair: the same colour family, but not a straight swap. Abyssal Turquoise is a little darker, warmer than Shadow Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Abyssal Turquoise is a little darker, warmer than Shadow Grey.
The same difference applies the other way round: Shadow Grey is a little lighter, cooler.
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 Shadow Grey on the colour wheel See Abyssal Turquoise on the colour wheel
All matches: Shadow Grey equivalents · Abyssal Turquoise equivalents