I should also explain what KMSpico is. It's an activation tool that uses a Key Management Service (KMS) to activate Microsoft products. However, using it on retail copies isn't legal. The version 913 is specific, so maybe there were updates or specific fixes in that version.
To help clarify the differences, here is a breakdown based on official Microsoft guidelines and common security standards: Official KMS Activation download+2021+office+2013+activator+kmspico+913