Mechanicus Standard Grey vs Deep Rusto

How close are they?

ΔE 10.3, fair: the same colour family, but not a straight swap. Deep Rusto is a little darker than Mechanicus Standard Grey.

Can I use Deep Rusto instead of Mechanicus Standard Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Deep Rusto is a little darker than Mechanicus Standard Grey.

Can I use Mechanicus Standard Grey instead of Deep Rusto?

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