Hexos Palesun vs Bright Pale Yellow

How close are they?

ΔE 19.3, loose: different enough that you should pick on purpose. Bright Pale Yellow is a little lighter, much more muted than Hexos Palesun.

Can I use Bright Pale Yellow instead of Hexos Palesun?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Bright Pale Yellow is a little lighter, much more muted than Hexos Palesun.

Can I use Hexos Palesun instead of Bright Pale Yellow?

The same difference applies the other way round: Hexos Palesun is a little 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.