Pakistan scored 358 runs batting first for the loss of seven wickets and restricted Kent to 258 runs in the chase.
There is significant damage to his shoulder and Billings will need to undergo a surgery which is scheduled next week.
Both the series are scheduled to start in May.
He recently played for the Kolkata Knight Riders in the IPL.
All the major stats and numbers record across the One-Day Cup games on Friday.
"Matt is a young talent who is very hungry for success,"- Kent CEO.
"I look back with nothing but smiles and laughter."
He played 2 Tests, 45 ODIs and 17 T20Is for England.
With no idea about the scores of both games, Walker decided to gamble and fly towards Maidstone.
The Isle of Oxney, a team of 11 players took on The Professionals team that had only two players on their side.