Boone Tan vs Light Yellow

How close are they?

ΔE 38.1, loose: different enough that you should pick on purpose. Light Yellow is much more saturated, cooler than Boone Tan.

Can I use Light Yellow instead of Boone Tan?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 38). Light Yellow is much more saturated, cooler than Boone Tan.

Can I use Boone Tan instead of Light Yellow?

The same difference applies the other way round: Boone Tan is much more muted, 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.