PSI is a ratio, bigger or smaller the PSI is the same.
The tire label and owners manual differ on air pressure, I side with the tire company.
By "tire label" I trust you are not referring to the max PSI figure molded into the side wall of the tire?
Neither the owner's manual, nor any labels on the scooter, will ever agree with that max PSI number molded on the tire.
That number on the tire is the PSI past which the tire should never be inflated - it is not the PSI recommended by the people who designed and built the scooter or motorcycle. The correct figure is stated in the manual and is also printed prominently on the scooter, depending on one or two-up riding.
Most tire experts will tell you that putting an over-sized tire on a stock scooter wheel will actually pinch it out of it's designed shape - and will actually
slightly reduce the contact patch of tire/road. Only increasing the
wheel rim width along with the tire width will increase the contact patch.
But, try explaining that to "bigger is better" folks.
Stig