Rusty Gold vs Warplock Bronze

How close are they?

ΔE 16.6, loose: different enough that you should pick on purpose. Warplock Bronze is a little darker, much more muted, warmer than Rusty Gold.

Can I use Warplock Bronze instead of Rusty Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Warplock Bronze is a little darker, much more muted, warmer than Rusty Gold.

Can I use Rusty Gold instead of Warplock Bronze?

The same difference applies the other way round: Rusty Gold is a little lighter, 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.