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DS90UB941AS-Q1: Datasheet question

Part Number: DS90UB941AS-Q1

Hi team

Customer would like to know why there is a pin name update for the 941AS, since they found the old version 941A datasheet in 2019 and they see the latest one is 941AS. Therefore, could you please kindly help to reply to these questions:

1. Reason for change
2. Is the pin name change accompanied by a function change? What is the impact? 

I have told customer to follow the 941AS latest datasheet but since they had recorded the 941A datasheet in their system so they would like to know the reason and function replacement, thank you.