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Finding difference in values in the same row, different column within a Matrix

I've been stumped with the solution to this problem. I have a matrix table that produces this output.





The desired output is something like this ( figures are made up) 




I want to display the difference in ranking and CT% (Market Share) between the value in a row and the following value in the next column within the row. There are no dates within the source data the output is a string of the respective period.  


Within the data, you have Years and Quarters within the period field represented below:


example for 2021: 21Q1, 21Q2, 21Q3, 21Q4, 21Y


I wish not to be restricted to QoQ and YoY, for example, if a user picks Q4 2022 and Q1 2020 I would like to be able to show the difference between the selected values.


Many thanks,


Super User
Super User

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
Please show the expected outcome based on the sample data you provided.

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