Thallax Gold vs Top Brass

How close are they?

ΔE 21.8, loose: different enough that you should pick on purpose. Top Brass is noticeably lighter, much more muted than Thallax Gold.

Can I use Top Brass instead of Thallax Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Top Brass is noticeably lighter, much more muted than Thallax Gold.

Can I use Thallax Gold instead of Top Brass?

The same difference applies the other way round: Thallax Gold is noticeably darker, 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.