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BQ25730: Question about charge operation difference between BQ25730 and BQ25731.

Part Number: BQ25730
Other Parts Discussed in Thread: BQ25731

Hello guys,

One of my customers uses BQ25730 and BQ25731 for their current mass-production.

BQ25731 is used mainly for the production. 
But they use BQ25730 too as a backup device.
When BQ25730 is used for the production, PCB, external parts and control program are completely same.

In case of 9V input, they found that BQ25731 was not charging but BQ25730 was charging.

They want to know what is the cause of this phenomenon.
Is there any difference of charging condition between BQ25730 and BQ25731?

your reply would be much appreciated.

Best regards,
Kazuya.