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BQ78350-R1A: What is the difference between BQ78350-R1 and BQ78350-R1A?

Part Number: BQ78350-R1A
Other Parts Discussed in Thread: BQ78350-R1

I see that the BQ78350-R1 is no longer recommended for new designs, and the BQ78350-R1A is recommended as a drop-in replacement. 

Is there a hardware difference between the R1 and the R1A, or can I update an R1 to an R1A with a new SREC?