ΔE 23.1, loose: different enough that you should pick on purpose. Sirenscale Green is noticeably lighter, more muted, cooler than Glittering Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Sirenscale Green is noticeably lighter, more muted, cooler than Glittering Green.
The same difference applies the other way round: Glittering Green is noticeably darker, more saturated, 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 Glittering Green on the colour wheel See Sirenscale Green on the colour wheel
All matches: Glittering Green equivalents · Sirenscale Green equivalents