From my understanding 64-65 B body pedals will work in a 62-63 application, but 62-63 pedals will not work in 64-65 applications.
There is a piece welded on the front of the basket with a 90 degree bend that points down on 62-63 pedals and it points up on 64-65 pedals.
I will post some pictures from brewers performance website to help explain the difference. The first picture will be 62-63 pedals the second will be the 64-65 pedals.
Matt