Fenrisian Grey vs Gunship Gray 2

How close are they?

ΔE 9.3, close: similar, with a visible difference side by side. Gunship Gray 2 is a little darker, more muted, cooler than Fenrisian Grey.

Can I use Gunship Gray 2 instead of Fenrisian Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gunship Gray 2 is a little darker, more muted, cooler than Fenrisian Grey.

Can I use Fenrisian Grey instead of Gunship Gray 2?

The same difference applies the other way round: Fenrisian Grey is a little lighter, more saturated, warmer.

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.