Dark Gray vs Light Turquoise

How close are they?

ΔE 13.6, fair: the same colour family, but not a straight swap. Light Turquoise is a little darker, more saturated than Dark Gray.

Can I use Light Turquoise instead of Dark Gray?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Turquoise is a little darker, more saturated than Dark Gray.

Can I use Dark Gray instead of Light Turquoise?

The same difference applies the other way round: Dark Gray is a little lighter, more muted.

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.