Combining data of two seperatly filtered Matrix Visualtions into a third Matrix for comparison

Hi, I'm very new to Power Bi but have several years of experience with other BI tools and probably am just having issues with not knowing the correct terminology to use. In a new job, I have been given Power BI to write a specific report but have run into a specific functionality question. The report goes like this: I need to represent three Matrix Visualizations (A,B,C). Matrix A and B are simple and straight forward. They each need to show the data for a different Client, that is different filters on each Matrix. The problem is Matrix C needs to show the difference between the two clients from A and B, without having its own set of filters.  How do I do this?