Would common engines improve carrier-aircraft availability?

Would a common engine improve Japanese carrier-aircraft operations and sustainability?

Yes. It would simplify maintenance and repair and increase aircraft availability, although it would not fix the shortage of pilots.

Standardizing the air group's engines would make aircraft easier to maintain and keep in service. More aircraft would be available for operations, with greater capacity to repair them and keep their engines running. Those benefits would improve force generation and sustainability. The shortage of pilots would remain.