Someone might have a more elegant solution but here's how I've done it:
Go the reporting tab, queries, new query
Select Managed Systems, next
Display results as a Summary Table, Item label is Agent Version, sort it whatever way you like, next
For the columns I picked System Name, Last Update, & Assignment Path, next
For Filter select the property "Sytem Name" who's value = Is Duplicated
I also created a separate one for machines without tags and if I wanted to bother I'm sure I could combine them in to one query.
Hope this helps.