A DNA sample from one of the men killed in the US drone attack was successfully matched with a close relative of Mansour, the interior ministry statement late on Sunday said.
American and Afghan officials had already confirmed Mansour's death, but Islamabad had declined to do so before the DNA test results.
On Sunday, the family of his driver -- identified as Mohammed Azam -- filed a police case against unknown US officials, seeking to press murder charges against them, police officer Abdul Wakil Mengal said, the Associated Press reported.
The family maintains Azam's innocence, and describes him as the sole breadwinner and a father of four. They say they want justice.
The identity of the US officials involved in the drone strike is unknown, and it was unclear if the charges will relate to those who ordered the attack or the US servicemen who carried it out.
Azam's family may be seeking a trial in absentia and a symbolic victory or they may attempt to push for compensation.
Earlier this week, the Afghan Taliban unanimously selected Mullah Haibatullah Akhundzada as their new head.