In a DSfW tree or in a DSfW domain in a legacy tree, all the users are Linux User Management users. However, you can notice the following differences:
The pool of UIDs and GIDs are different for DSfW and Linux User Management in a legacy tree.
In DSfW, the UIDs and GIDs are allocated from the rIDSet object. In a legacy eDirectory tree in which Linux User Management is configured, the UIDs and GIDs are allocated from the UNIX Config object.