Hoplite Gold vs Light Bronze

How close are they?

ΔE 39.4, loose: different enough that you should pick on purpose. Light Bronze is much more muted, warmer than Hoplite Gold.

Can I use Light Bronze instead of Hoplite Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 39). Light Bronze is much more muted, warmer than Hoplite Gold.

Can I use Hoplite Gold instead of Light Bronze?

The same difference applies the other way round: Hoplite Gold is 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.