Hexos Palesun vs Twin Suns Yellow

How close are they?

ΔE 18.5, loose: different enough that you should pick on purpose. Twin Suns Yellow is much more muted, cooler than Hexos Palesun.

Can I use Twin Suns Yellow instead of Hexos Palesun?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Twin Suns Yellow is much more muted, cooler than Hexos Palesun.

Can I use Hexos Palesun instead of Twin Suns Yellow?

The same difference applies the other way round: Hexos Palesun is much more saturated, 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.