It's possible, but you'll need to do one of two options (if I'm understanding the question correctly):
1) Request a script that saves only current level, items, stats, etc. and not the map; remember that your database will have to be exactly the same in both projects.
2) At the end of the first project, create a blank map that asks you to save and then quits. In the 2nd project, copy that map over (it has to be the same ID!) and edit the event so instead of quitting, it transfers you to another map and continues. You'll also have to keep the database the same.
Good luck with it.