ΔE 25.3, loose: different enough that you should pick on purpose. Aquamarine is more saturated, warmer than Gigawatt Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Aquamarine is more saturated, warmer than Gigawatt Blue.
The same difference applies the other way round: Gigawatt Blue is 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 Gigawatt Blue on the colour wheel See Aquamarine on the colour wheel
All matches: Gigawatt Blue equivalents · Aquamarine equivalents