Great Hall Grey vs Miskatonic Grey

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Miskatonic Grey is more muted than Great Hall Grey.

Can I use Miskatonic Grey instead of Great Hall Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Miskatonic Grey is more muted than Great Hall Grey.

Can I use Great Hall Grey instead of Miskatonic Grey?

The same difference applies the other way round: Great Hall Grey is more saturated.

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.