Is it obligatory to return the remaining amount from a traffic accident compensation after purchasing used spare parts for the car, knowing that the compensation was estimated based on original spare parts and that the other party was at fault?

If a collision occurs between two cars, the party at fault is obligated to guarantee what he damaged, whether it be a life, a limb, or property. He is thus liable for the blood money (diyyah) for lives and limbs, and the value of what he damaged in the car, in addition to the difference between the sound car and the one that underwent repair, unless its owner pardons him. The injured party, if he receives the money, may dispose of it as he wishes, because it has become his property.