How can I use conditional formatting in an Excel table using structured references?

Include the table name and add the @ symbol to reference row for row.

=INDIRECT("Table1[@col1]")=INDIRECT("Table1[@col2]")

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For me the following works: first cell of the column to be formatted is selected, then conditional formatting --> use a formula --> edit rule: put in table column to be formatted = column to compare to the first cell should be formatted now. Then I used format painter for the rest of the column, in your case Col2. it worked for me, hope it works for you as well. - Martijn

Disregard: After rechecking the effects, I noted the conditioning does not work.