Displaying the difference between two visuals into a third visual

Hi all!

I'm trying this again and will provide better detail. I simplified my data model and will expain with screenshots. The purpose of the report is to query several different databases and list the software versions installed on each one. Each database connection is populated with the same SQL query (but I manually added a column to each one with the server's name). The data sources have been appended into one large merged table. I created dims to make filtering easier, but it may not be helping.

From the report level, the filtering hierarchy looks like this: Environment1 / Environment2 -> App Name -> App Version -> Ruleset Name -> Ruleset Version.

The idea is to pick two servers from the slicers, display the results in their respective visuals, and displaying the differences between the two visuals into the third visual. How is this achievable?

Data Model:

Report:

In the report screenshot above,the left side with a shaded box are filters and the three tables to the right are populated like this: The first table is from the Source filter, second table is from the Target filter, and finally the third table is where I want to display the rows that exist in Table 1 but not Table 2.

Any help would be greatly appreciated!