Newton's Third Law and Inertia

Newton's third law says that if body A exerts a force on body B, body B
reacts with an equal and opposite force against body A.

Newton, speaking of inertia, says: "A body exerts this force [inertia]
only, when another force, impressed upon it, endeavors to change its
condition".

It seems that he is talking about exactly the same forces.

If not, what differences are there between the two?

Luigi Fortunati