Question

how is acceleration due to gravity different from gravitational constant

Answer 1

Acceleration due to gravity caused by gravitational pull of the earth

Answer 2

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Acceleration due to gravity (g),

as the name suggests is the acceleration caused by gravitational pull of the earh or any other planet which has gravitational force.

For example,

Earth has gravitational force

and

Moon has 1/6th of that of earth's.

Accleration due to gravity of earth is 9.8 m/s^2

Now,

Universal Gravitational constant (G)

it is the constant which has same value wholly in the universe.

its value is 6.673×10^(-11)  N m^2 kg^(-2)