Bucharest is 1 hour ahead of Brussels
Best overlap: 8:00 AM to 5:00 PM in Brussels is 9:00 AM to 6:00 PM in Bucharest.
Both teams are at their desks between 8:00 AM to 5:00 PM in Brussels and 9:00 AM to 6:00 PM in Bucharest. 9 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.