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Currently field to field comparison is not supported in reports but I have heard its coming not sure on when its coming, meanwhile, please upvote and promote the below idea, until then the only alternative is creating a formula field of checkbox type that return to true when both fields are same and use that field in the filter criteria

Assuming the Closed Date is a Date/Time field, the formula will be as below, formula return type checkbox

DATEVALUE(CreatedDate) = DATEVALUE(ClosedDate)

use the insert field button to select the field API Name of ClosedDate

Link to the Idea