S
PPAP documentation should be able to reflect all the changes and should give a clear control method . With this the question has more to do with alternate machine than multiple routing. Multiple machine ( which can increase in no later as well ) should be added to PFD. All machines should have separate Cp studies. Problem can come if there are two type of processes . ( typically contigency plan required by TS e.g semiauto and Automatic set-up In-house vs outsourced operation etc ). This should be shown as separate routing in PFD and should be addressed separately in Control plan and FMEA. Natually SOP's in Both cases will different.
Sunil
Sunil