ΔE 10.7, fair: the same colour family, but not a straight swap. Pharaoh Guard is a little lighter, more saturated, warmer than Aquatic Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Pharaoh Guard is a little lighter, more saturated, warmer than Aquatic Turquoise.
The same difference applies the other way round: Aquatic Turquoise is a little darker, more muted, 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 Aquatic Turquoise on the colour wheel See Pharaoh Guard on the colour wheel
All matches: Aquatic Turquoise equivalents · Pharaoh Guard equivalents