Song Hong
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WS-20 are based on CFM-56 core. Leap-1C is an advance version of CFM-56.
The totally different D30KP2 engine can be easily replaced by WS-20 engine for Y-20 as demonstrated by a Y-20 prototype flying the engine. When CHinese engineer design the C919, such consideration has long been taken in with swapping out engine with another. Of cos, testing and integration are still needed. But its not as difficult as you all think,
The commercial turbofan is optimized for fuel efficiency while the military ones are optimized for ruggedness. You dont normally use military engine on commercial flight because that will means losing monies for airlines.
However RR or GE will will the same base technologies develop different engine optimized for their respective mission.