Calculate difference last month in total count per Type

[sclarebout]

Hi there,

I'm not quite getting the result I was hoping for. I have a list of licenses for a customer where we want to see the changes in Power BI. Here's the data we currently made up with queries: 

As we can see, there are some differences, but I like to have these differences as a measure so I can slice my graphs based on the selected month. I already managed to get the measure for 'New Licenses' but not for the removed ones. 

Any help?