are input shafts interchangeable between 47rh and re? snapped mine. didn’t like lockup launches

 

From what I see on the PATC and Sonnax sites, it looks to me (big disclaimer here) like they are the same.

Common Torque Converter - this makes me think they at least have the same diameter/spines at the TC

Sonnax shaft - specifically mentions both models

You might also look on Transtar's site and see what they show