Hi @valkyre57 - You can't really do that with a Validator because those fire on a transition in the workflow, not just a field update.
What we do in cases like that is to create an Automation rule that triggers on the Approvers field getting updated.
Then we add an advanced condition based on comparing fields. We then compare the value of the Reporter field to the Approver field. If they match then the rule sends an email to the interested parties.
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