Difference between N9K-SUP-A and N9K-SUP-B?

I can't find any information on the practical differences between the two base supervisor models (epic comparison chart Cisco). Does anyone have any idea how it affects routing or switching having the extra processing / RAM?

Datasheet: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/datasheet-c78-729404.html

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