ΔE 20.8, loose: different enough that you should pick on purpose. Glittering Green is noticeably darker, more saturated, cooler than Metallic Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Glittering Green is noticeably darker, more saturated, cooler than Metallic Green.
The same difference applies the other way round: Metallic Green is noticeably lighter, more muted, warmer.
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 Metallic Green on the colour wheel See Glittering Green on the colour wheel
All matches: Metallic Green equivalents · Glittering Green equivalents