ΔE 21.3, loose: different enough that you should pick on purpose. Abyssal Turquoise is much more saturated than Ultimate Cup of Coffee.
Can I use Abyssal Turquoise instead of Ultimate Cup of Coffee?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Abyssal Turquoise is much more saturated than Ultimate Cup of Coffee.
Can I use Ultimate Cup of Coffee instead of Abyssal Turquoise?
The same difference applies the other way round: Ultimate Cup of Coffee is much 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.