Thamar Black vs Bronze Green

How close are they?

ΔE 17.4, loose: different enough that you should pick on purpose. Bronze Green is noticeably lighter, more saturated than Thamar Black.

Can I use Bronze Green instead of Thamar Black?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Bronze Green is noticeably lighter, more saturated than Thamar Black.

Can I use Thamar Black instead of Bronze Green?

The same difference applies the other way round: Thamar Black is noticeably darker, more muted.

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.