ΔE 24.3, loose: different enough that you should pick on purpose. Aquamarine is a little darker, more muted, cooler than Mint Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Aquamarine is a little darker, more muted, cooler than Mint Green.
The same difference applies the other way round: Mint Green is a little lighter, more saturated, warmer.
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 Mint Green on the colour wheel See Aquamarine on the colour wheel
All matches: Mint Green equivalents · Aquamarine equivalents