Third Member Question

Is the 2070741 Third Member in a pre 64 the same as a post 65? Will they work in the post 65 as a
Is the 2070741 Third Member in a pre 64 the same as a post 65? Will they work in the post 65 as a direct swap? I have found a few and will purchase if they are. Any help would be appreciated! Thanks!
The 2070741 is on a 64 8.75 I believe since it has the pressed on hubs