ΔE 8.7, close: similar, with a visible difference side by side. Aquamarine is a little lighter, more saturated than Turquoise Siren.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Aquamarine is a little lighter, more saturated than Turquoise Siren.
The same difference applies the other way round: Turquoise Siren is a little 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 Turquoise Siren on the colour wheel See Aquamarine on the colour wheel
All matches: Turquoise Siren equivalents · Aquamarine equivalents