ΔE 18.8, loose: different enough that you should pick on purpose. Light Green (Yellow Shade) is noticeably lighter, more saturated than Gauss Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Light Green (Yellow Shade) is noticeably lighter, more saturated than Gauss Green.
The same difference applies the other way round: Gauss Green is noticeably darker, more muted.
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 Gauss Green on the colour wheel See Light Green (Yellow Shade) on the colour wheel
All matches: Gauss Green equivalents · Light Green (Yellow Shade) equivalents