CADstudio DWGsync is an Autodesk® AutoCAD® add-on utility for Autodesk AutoCAD 2020/2019/2018/2017, 2016/2015/2014/2013 (both 32/64-bit).
This .NET tool synchronizes zooming/panning of 2 or more similar DWG files. It can be used e.g. for visual comparison of drawings, co-viewing a previous version of a drawing, etc. Any view change (zoom/pan) in the "master" will be carried over to the other drawings opened in the same session.