For having Fabrication metric content V7.06 in Revit 2023 you need to install CAMduct 2023 and then copy the V7.06 library in path where other library (V2.3) is in. (C:\Users\Public\Documents\Autodesk\Fabrication 2023\Revit MEP Metric Content). Open the CAMduct and Add Link/ Choos V7.06.

Now, in Revit you are able to reload the Fabrication V.06.