Electric Lime vs Dorn Yellow

How close are they?

ΔE 21.8, loose: different enough that you should pick on purpose. Dorn Yellow is a little lighter, more muted, warmer than Electric Lime.

Can I use Dorn Yellow instead of Electric Lime?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Dorn Yellow is a little lighter, more muted, warmer than Electric Lime.

Can I use Electric Lime instead of Dorn Yellow?

The same difference applies the other way round: Electric Lime is a little darker, 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.