Comparing Tool for Reporting Services Objects I have three Reporting Services Instances (Server), all in version of SQL-Server 2017.

All instances have the same tree structure with hundreds of objects (datasources, datasets and reports)

Now I'm looking for a tool which compares the same objects between two instances. I already use the redgate comparing tools but they do not cover reporting services.

Any suggestions?
So basically what @saihtam8 said in his comment.

This SO thread might be helpful to you: Where does a published RDL file sit?

Essentially just compare the report BLOB columns (Content? in SQL Server 2008 R2) in the Catalog tables across each server instance. 
In SQL Server 2008 R2, it looks like there are DataSets and DataSource tables as well which you can compare.