You can use the Synchronize tool to identify differences between the Advance Steel model and the updated Revit model.

Advance Steel and Revit Interoperability

Share data between these two highly capable programs to simplify your steel workflow. Advance Steel is a 3D modeling and detailing program built on top of AutoCAD, meant to enable structural engineering professionals to quickly produce the drawings and other documents needed to fabricate and construct steel-framed structures. As such, …