Banana Split vs Deep Yellow

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Deep Yellow is a little darker, more muted, warmer than Banana Split.

Can I use Deep Yellow instead of Banana Split?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Deep Yellow is a little darker, more muted, warmer than Banana Split.

Can I use Banana Split instead of Deep Yellow?

The same difference applies the other way round: Banana Split is a little lighter, more saturated, cooler.

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.