IJN Q1 Anti-Glare Blue-Black vs Gloss Black

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Gloss Black is a little darker than IJN Q1 Anti-Glare Blue-Black.

Can I use Gloss Black instead of IJN Q1 Anti-Glare Blue-Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Gloss Black is a little darker than IJN Q1 Anti-Glare Blue-Black.

Can I use IJN Q1 Anti-Glare Blue-Black instead of Gloss Black?

The same difference applies the other way round: IJN Q1 Anti-Glare Blue-Black 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.