The same cells, with all 200 in series would make 800 volts.
During charging, all the current in the 800V arrangement would go through every cell. In the 400 volt arrangement half the current goes through each cell. The 800V pack only needs half the current for a given power, but the although the
During charging, all the current in the 800V arrangement would go through every cell. In the 400 volt arrangement half the current goes through each cell. The 800V pack only needs half the current for a given power, but the although the
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BTW, the number of cells may be much greater than 200, but the same logic applies.
Given that current at 800V are half as much, this is mostly a wash for the two possible choices.