Thallax Gold vs Pucker

How close are they?

ΔE 21.8, loose: different enough that you should pick on purpose. Pucker is noticeably lighter, more saturated, cooler than Thallax Gold.

Can I use Pucker instead of Thallax Gold?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Pucker is noticeably lighter, more saturated, cooler than Thallax Gold.

Can I use Thallax Gold instead of Pucker?

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

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.