I would hazard that the repair to the Cat. 2 damage is reflected in the re-paint around the rear fuselage/rudder.
It would be the Canadians that over-painted the original serial number, it was not obscured by the censor.
K9265 was an ex-103 squadron (RAF) aircraft. It was an early example from the second production batch, delivered to the RAF in 1938 and early 1939. Whether it was one of those sent to France with 103 squadron and the Advanced Air Striking Force would require some investigation. Given the date of its arrival in Canada it was one of those released when the squadron, now part of 1 Group Bomber Command, converted to Wellingtons.
Cheers
Steve