Find all Differences between 2 lists + Power Query

I have (for this example) 2 tables. In each of these tables I have created a key to uniquely identify an employee and a department. Month to month this may change.

What I would like to be able to do is find all the differences between the two tables. So far I have only been able to find the differences based on how I write the M code. I.E. the differences between June and July. But I also need the changes July versus June. As there may be differences as well.

I have attached a sample workbook with 2 small tables. They are loaded into PQ and a third table was created to show the differences.
What I would also like to do is make this dynamic, where I can select which tables I want to compare. I.E. July 2021 v January 2021 ETC. (I think this is done with Parameters within PQ??)

Any help or guidance would be greatly appreciated.

Thank you this is helpful.
What I am ultimately after is a single table (single merge in PQ) that contains both the June v July as well as the July v June.
Is something like this possible?

Thank you
This is, in essence, what I had.
I was able to find the difference from June v July, it’s the same process to find July v June and then append. I thought there may be a more efficient way to accomplish this.
I will work on this further, and also work on how I may be able to dynamically compare monthly the tables.

This is an excellent alternative.
I was stuck in trying to solve with power query.

Thank you very much for time and for the effort!