ΔE 16.5, loose: different enough that you should pick on purpose. Cobalt Teal is a little lighter, warmer than Aegis Aqua.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Cobalt Teal is a little lighter, warmer than Aegis Aqua.
The same difference applies the other way round: Aegis Aqua is a little darker, 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 Aegis Aqua on the colour wheel See Cobalt Teal on the colour wheel
All matches: Aegis Aqua equivalents · Cobalt Teal equivalents