Golden Armour vs Gladius Bronze

How close are they?

ΔE 29.1, loose: different enough that you should pick on purpose. Gladius Bronze is noticeably lighter, more muted than Golden Armour.

Can I use Gladius Bronze instead of Golden Armour?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Gladius Bronze is noticeably lighter, more muted than Golden Armour.

Can I use Golden Armour instead of Gladius Bronze?

The same difference applies the other way round: Golden Armour is noticeably darker, 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.