Ancient Honey vs Olive Yellow

How close are they?

ΔE 29.3, loose: different enough that you should pick on purpose. Olive Yellow is noticeably darker, much more muted, cooler than Ancient Honey.

Can I use Olive Yellow instead of Ancient Honey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Olive Yellow is noticeably darker, much more muted, cooler than Ancient Honey.

Can I use Ancient Honey instead of Olive Yellow?

The same difference applies the other way round: Ancient Honey is noticeably lighter, 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.