Will 32 PB exhaust manifold work on a 31 PA?

[FourDoor]

Maybe someone will have a better answer however in the Master Parts book it says the PA and PB manifolds have different part numbers-PA=391257,PB=390865....... BUT the end gaskets are the same number right through from the Q to the PB (#5112) and then the 'exhaust,center' and the 'intake to exhaust' numbers (#616278 and #616277) are the same for the PA and PB. The difference may be very subtle and not stop you from using the PB manifold on the PA. Chrysler wouldn't have given them the same part number if there was ANY difference even one that makes no pratical interchange difference. Anybody else got a final answer?? :)? ?

[BryanD]

I'm looking for a replacement exhaust manifold for my 31 PA.? The one I have now "works" (marginally) but has warpage and cracks.? I may eventually send it in to get it rebuilt, but in the meantime I would like to install a replacement.? I've not had much luck finding a PA manifold in good shape but I've seen several PB manifolds -- including two companies that apparently manufuacture new "replica" PB manifolds.? SO: I'm wondering if the PB manifold would work?? I know its basically the same engine, so it seems like the manifolds should be interchangeable.? Can anyone confirm that a PB manifold will almost certainly work?

...thanks in advance.