I have custom model "myModel.xml" in some module. I extended it and installed using dynamic models. Does dynamic model overrides already installed model? may be there any conflicts if model names are identical?
The problem is not only a name problem. If your model is already in use, it needs to be incremental. Deleted items should be accounted for. The other problem is the namespace, you can't define the same namespace twice even in different models, or the system will complain with an error. I can't remember whether I used the same prefix or not.