ΔE 30.6, loose: different enough that you should pick on purpose. Battle Axe Brass is noticeably lighter, much more muted, warmer than Retributor Armour.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 31). Battle Axe Brass is noticeably lighter, much more muted, warmer than Retributor Armour.
The same difference applies the other way round: Retributor Armour is noticeably darker, much more saturated, cooler.
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.
See Retributor Armour on the colour wheel See Battle Axe Brass on the colour wheel
All matches: Retributor Armour equivalents · Battle Axe Brass equivalents