Golem Grey vs Shadow Black

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Shadow Black is a little darker than Golem Grey.

Can I use Shadow Black instead of Golem Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Shadow Black is a little darker than Golem Grey.

Can I use Golem Grey instead of Shadow Black?

The same difference applies the other way round: Golem 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.