The plugs are different which is why they go to 100K not 63K but I don't know about the belt, probably nothing. The service interval also changed from 9,000 to 10,000 miles. Every other manufacturer is extending the interval between services and so is Toyota.
It was the same in 1993/1994. The service schedule changed from 6,000 to 9,000 miles with nothing changing on the car. One month they need servicing at 6,000 and then the next month they can go another 3,000 miles.
In the US the cars have much shorter schedules but use the same parts.