Element Duplicate repeats same family type

Revit
2

Are the Walls already differentiated in the CAD?

But here are some suggestions.

If the Walls are differentiated;

  1. Create the needed Wall Types (as a one off).
  2. Group the CAD lines by their propertie(s) (Width) so you can group the Curves.
  3. Apply the Wall types to the sorted Groups / Curves.

Another suggestion;

Replace the Walls by one Type (Element Ids) and delete the unused ones afterwards.
Your graph created Wall Types with the same name, but should have different Element Ids)

PS
Showing more of your graph of sharing your .dyn would be a great(er) help.

PPS
I noticed it is possible to create a (Family / System) Types with the same name when using Dynamo! Which wouldn’t be possible normally (by duplicating in Revit).