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BQ8020 and BQ20826 datasheets

Other Parts Discussed in Thread: BQ8020, BQ40Z50

I am looking to get data sheets for the BQ8020 and BQ20826 to compare them.  I understand that these are blank and/or custom chips where the user develops the own firmware.  What I am trying to understand is if these chips have the same pinouts and can be interchangeable.  Thanks