Pale Green vs Lime Green

How close are they?

ΔE 26.0, loose: different enough that you should pick on purpose. Lime Green is more muted, warmer than Pale Green.

Can I use Lime Green instead of Pale Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Lime Green is more muted, warmer than Pale Green.

Can I use Pale Green instead of Lime Green?

The same difference applies the other way round: Pale Green is 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.