ΔE 22.0, loose: different enough that you should pick on purpose. Jade Green is noticeably lighter, much more saturated, warmer than Antiquity Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Jade Green is noticeably lighter, much more saturated, warmer than Antiquity Green.
The same difference applies the other way round: Antiquity Green is noticeably darker, much more muted, 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 Antiquity Green on the colour wheel See Jade Green on the colour wheel
All matches: Antiquity Green equivalents · Jade Green equivalents