Mechanicus Standard Grey vs Steely Blue

How close are they?

ΔE 15.7, loose: different enough that you should pick on purpose. Steely Blue is noticeably darker, more saturated than Mechanicus Standard Grey.

Can I use Steely Blue instead of Mechanicus Standard Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Steely Blue is noticeably darker, more saturated than Mechanicus Standard Grey.

Can I use Mechanicus Standard Grey instead of Steely Blue?

The same difference applies the other way round: Mechanicus Standard Grey is noticeably 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.