ΔE 21.0, loose: different enough that you should pick on purpose. Aquamarine is noticeably lighter, more saturated, warmer than Ice Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Aquamarine is noticeably lighter, more saturated, warmer than Ice Blue.
The same difference applies the other way round: Ice Blue is noticeably darker, 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 Ice Blue on the colour wheel See Aquamarine on the colour wheel
All matches: Ice Blue equivalents · Aquamarine equivalents