Devil's Advocate
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None of the stories to which you linked claims NH is replacing RR with GE. Although the engines themselves are periodically swapped for maintenance and repair the engine type that was supplied at delivery is almost always the same type installed when the aircraft is decommissioned or written off decades later. Replacing 100 engines is a huge and expensive undertaking and RR has little if any incentive to assist NH with moving to another engine manufacturer.It's easy on the 787, which was specially designed to operate interchangeably between the two engine types. To swap engines, all they have to do is slightly modify the pylons, stick on the new engines, and they're done.Changing engine types on an already-built jet is a costly and extensive process, and thus is rarely ever done.