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This is really an article saying indexes are different, not that ETFs are different. To put it simply, the S&P 500 is different from DJIA, and the Wilshire 5000 is different from the Russell 3000 (duh). Same thing for sector indexes.
Differences between ETFs tracking the same index would include sampling (and how) vs. full replication, UIT vs mutual fund structure (cash drag), whether creation units are always securities (often not true for leveraged index funds, commodity funds), etc. Not to mention the unique structure that Vanguard ETFs have.
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Differences between ETFs tracking the same index would include sampling (and how) vs. full replication, UIT vs mutual fund structure (cash drag), whether creation units are always securities (often not true for leveraged index funds, commodity funds), etc. Not to mention the unique structure that Vanguard ETFs have.