a United ticket from IAD-ZRH-TLV
swiss leg ZRH-TLV got cancelled.
We were re-routed for a Lufthansa flight the next day through FRA.
3 weeks passed, no miles credited.

Question is - when re-routed after a cancelled flight, does the ticket number change? I did not keep the new boarding passes to be able to check and I need to claim those missing miles.

Thank you!!