ΔE 8.8, close: similar, with a visible difference side by side. Phthalo Green (Blue Shade) is a little darker, warmer than Sybarite Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Phthalo Green (Blue Shade) is a little darker, warmer than Sybarite Green.
The same difference applies the other way round: Sybarite Green is a little lighter, 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 Sybarite Green on the colour wheel See Phthalo Green (Blue Shade) on the colour wheel
All matches: Sybarite Green equivalents · Phthalo Green (Blue Shade) equivalents