ΔE 11.0, fair: the same colour family, but not a straight swap. Green Shark Skin is a little lighter, more saturated, warmer than Turnbull Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Green Shark Skin is a little lighter, more saturated, warmer than Turnbull Turquoise.
The same difference applies the other way round: Turnbull 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 Turnbull Turquoise on the colour wheel See Green Shark Skin on the colour wheel
All matches: Turnbull Turquoise equivalents · Green Shark Skin equivalents