Lupercal Green vs Bronze Green

How close are they?

ΔE 16.4, loose: different enough that you should pick on purpose. Bronze Green is a little darker, more muted, warmer than Lupercal Green.

Can I use Bronze Green instead of Lupercal Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Bronze Green is a little darker, more muted, warmer than Lupercal Green.

Can I use Lupercal Green instead of Bronze Green?

The same difference applies the other way round: Lupercal Green is a little lighter, 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.