You can export an ASS file from Maya (with the XGen primitives) and then use an Arnold Procedural to load the ASS file into 3ds Max.
- C:\Program Files\Autodesk\Maya2018\plug-ins\xgen\bin
- C:\Program Files\Autodesk\Maya2018\bin
For example, you can copy this:
C:\Program Files\Autodesk\Maya2018\plug-ins\xgen\bin;C:\Program Files\Autodesk\Maya2018\bin;
and paste it at the beginning of the current Path:
Restart 3ds Max after you do this.
Then add the MtoA procedurals folder to the Plugin Search Path: