Possibly to merge 2 pmdb sql databases?

User is on 6.2.1 client with local db and had created some schedules for some turnarounds months ago.

I created a vm with a 6.2.1 db that they use from the site to share between 3 people and access from home. They have been using the vm exclusively. His supervisor now wants him to import the information on his local db which does not match what is on the vm but said exporting/importing will take too long and wont copy everything over (eps, etc?) . I am assuming the dbs will need to be merged somewhow through sql?

I have a .bak file of his pmdb$primavera database from his local pc. Can this be easily done?