Further to what's mentioned by Tristan, I would suggest copying the whole GP folder from the old employee to the new one, in case these users are working on different workstations.
This will not only ensure that the same report dictionary is used for both, but also ensure that the same code is running for both. This might eliminate further potential errors in the future.
In case the users are working on the same workstations, I would have nothing more valuable to add for what's mentioned above.
Best Regards,
Mahmoud AlSaadi