Mechanicus Standard Grey vs Blue FS15044

How close are they?

ΔE 13.1, fair: the same colour family, but not a straight swap. Blue FS15044 is a little darker, more saturated than Mechanicus Standard Grey.

Can I use Blue FS15044 instead of Mechanicus Standard Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Blue FS15044 is a little darker, more saturated than Mechanicus Standard Grey.

Can I use Mechanicus Standard Grey instead of Blue FS15044?

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