It is possible, but statistically unlikely, for an object you have created in one management domain to get the same UUID as an object you have created in another management domain.
Some objects have the same UUID on every single Check Point management domain ever. For example, 97aeb369-9aea-11d5-bd16-0090272ccb30 is the UUID for the object "Any". Many of these objects can't be edited.
Some objects have the same UUID on every management, but they can be edited, and they are actually unique per management. The default services, for example. 97aeb3d4-9aea-11d5-bd16-0090272ccb30 is always the UUID for the service object "http" on every management server. You can't change the port of this object, but you can change its Aggressive Aging settings, cluster sync settings, and so on.