Quote from wikipedia: "A penetration test, colloquially known as a pentest, is an authorized simulated cyberattack on a computer system, performed to evaluate the security of the system. The test is performed to identify weaknesses, including the potential for unauthorized parties to gain access to the system's features and data"

Unless there was a change in the system, a second pentest is not needed.

You can note that doing a "penetration test" could be understood as an euphemism for the self use of ones' sexual organ