Pilgrim A: stones all three Jamarahs after zawāl on both the 11th and 12th and then takes the early departure. Those two days involve 42 throws.
Pilgrim B: remains for the 13th and again stones each station seven times. The three days 11–13 involve 63 throws. The difference is the number of days stayed, not a different count per station.
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Book of Hajj: Return to Mina, Stoning the Three Jamarahs, and Days of Tashriq
Pilgrim A: stones all three Jamarahs after zawāl on both the 11th and 12th and then takes the early departure. Those two days involve 42 throws.
Pilgrim B: remains for the 13th and again stones each station seven times. The three days 11–13 involve 63 throws. The difference is the number of days stayed, not a different count per station.