How do i compare data between two arrays saved in separate variables and extract the unique data

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So basically I'm running two different api calls one to google calendar and another to Microsoft events and saving each of the these events results in their own variables, so i want to compare the results saved in those variables between each other and save the unique ones in a variable. This is my current set up

the data I'm trying to compare is in the google events and Microsoft events variable, then I'm trying to find all the elements where the title matches. but i keep getting this error

even thought the google variable contains this data

any idea on how to approach this?

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