In order for two template-ids to refer to the same function, 13.6 [temp.type] paragraph 1, bullet 1 requires that
their template-names refer to the same template
This makes it impossible for two template-ids referring to operator function templates to be equivalent, because only simple-template-ids have a template-name, and a template-id referring to an operator function template is not a simple-template-id (13.3 [temp.names] paragraph 1) .
Suggested resolution:
Change 13.6 [temp.type] paragraph 1, bullet 1 to read,
their template-names or operator-function-ids refer to the same template