ΔE 20.2, loose: different enough that you should pick on purpose. Lime Green is noticeably darker, much more muted, warmer than Light Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Lime Green is noticeably darker, much more muted, warmer than Light Green.
The same difference applies the other way round: Light Green is noticeably lighter, much 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.
See Light Green on the colour wheel See Lime Green on the colour wheel
All matches: Light Green equivalents · Lime Green equivalents