Dark Gray vs Blue Green

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. Blue Green is a little lighter, more saturated, warmer than Dark Gray.

Can I use Blue Green instead of Dark Gray?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Blue Green is a little lighter, more saturated, warmer than Dark Gray.

Can I use Dark Gray instead of Blue Green?

The same difference applies the other way round: Dark Gray 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.