Administratum Grey vs Rainy Gray

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Rainy Gray is a little darker than Administratum Grey.

Can I use Rainy Gray instead of Administratum Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Rainy Gray is a little darker than Administratum Grey.

Can I use Administratum Grey instead of Rainy Gray?

The same difference applies the other way round: Administratum Grey is a little lighter.

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.