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They aren't being compared to each other. They are compared to the players of their era.
In 1910 the league leader in homers hit 10. Cobb's 8 homers were tied for fourth in the league. Similar thing with contact is shown. Can't find out his strikeouts for 1910 specifically but he struck out 4.1% of the time for his career. League strikeout rate was just over 9.0% in 1910. In 2000 it was up to 16.5% where Piazza struck out 12.7%.
So both were better than average for their time, but if you wanted to compare overall numbers without accounting for era then players over the last couple decades would generally be unplayable due to no contact. Older players like from Cobb's era would have next to no power.
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