ΔE 16.0, loose: different enough that you should pick on purpose. Warplock Bronze is much more muted than Emperor Gold.
Can I use Warplock Bronze instead of Emperor Gold?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Warplock Bronze is much more muted than Emperor Gold.
Can I use Emperor Gold instead of Warplock Bronze?
The same difference applies the other way round: Emperor Gold is 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.