When a DWG or DXF file exported from Esri software is added to AutoCAD, the units are different than the original units of the data.
In AutoCAD, the default reference units are inches when adding another DWG file to the existing file as a reference. When adding an xref to AutoCAD, the user must change the units of the reference in the AutoDesk program. There are two locations in which this must be done.
Note: These settings are native to the AutoCAD application. Esri has no control over these settings, and these must be set in the AutoCAD application so that the referenced data will be the proper size, and in the proper location, to align with the source DWG.