Naples Yellow Hue vs Buff

How close are they?

ΔE 16.8, loose: different enough that you should pick on purpose. Buff is noticeably darker, more saturated than Naples Yellow Hue.

Can I use Buff instead of Naples Yellow Hue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Buff is noticeably darker, more saturated than Naples Yellow Hue.

Can I use Naples Yellow Hue instead of Buff?

The same difference applies the other way round: Naples Yellow Hue is noticeably lighter, more muted.

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.