Blue Gray vs Tanker Grey

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Tanker Grey is a little lighter, warmer than Blue Gray.

Can I use Tanker Grey instead of Blue Gray?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Tanker Grey is a little lighter, warmer than Blue Gray.

Can I use Blue Gray instead of Tanker Grey?

The same difference applies the other way round: Blue Gray is a little darker, 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.