In the zolca import, elements with UUIDs that already exist in a database (for processes or also for flows, units, ...) are not imported. In the JSON-LD import, you can specify if you want to overwrite, overwrite only newer, or not import.
![](https://ask.openlca.org/?qa=blob&qa_blobid=12652284174335740530)
In your case, the result thus depends on the database you import into. Why do you need to import a zolca file or "remodel everything from scratch"?