Pale Gold Yellow vs Hexos Palesun

How close are they?

ΔE 15.4, loose: different enough that you should pick on purpose. Hexos Palesun is noticeably lighter, more muted than Pale Gold Yellow.

Can I use Hexos Palesun instead of Pale Gold Yellow?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Hexos Palesun is noticeably lighter, more muted than Pale Gold Yellow.

Can I use Pale Gold Yellow instead of Hexos Palesun?

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