How do I check if text values are in a different list and count the values not in this list-CodePudding

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How do I check if text values are in a different list and count the values not in this list

Time：09-03

I have 2 lists with different clients. One List is from 2020 and one list is from 2021. I want to check how many new clients booked in 2021.

My approach would be to check if the Name of the client in 2021 is found in the 2020 list.

How do I achive this?