86-89 944 rear trailing arms

[Tim]

Hi Superman,
I noticed in your new article that the 86 - 89 944s alu arms (951 331 ....) are using either 477 501 065 hubs (to 86) or 944 331 067 hubs (from 87). Does that mean the 477 501 065 hub and 944 331 067 hub are interchangable as they are used with the same alu arms? Or the sub-axles are also different for 86 and for 87-89?

Thanks
Tim