Gunner Camo vs Basilicanum Grey

How close are they?

ΔE 20.5, loose: different enough that you should pick on purpose. Basilicanum Grey is noticeably lighter, much more muted than Gunner Camo.

Can I use Basilicanum Grey instead of Gunner Camo?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Basilicanum Grey is noticeably lighter, much more muted than Gunner Camo.

Can I use Gunner Camo instead of Basilicanum Grey?

The same difference applies the other way round: Gunner Camo is noticeably darker, much more saturated.

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.