Hello everyone. 
I already know a lot about make, but I’m currently facing a problem that I just can’t solve, even with ChatGPT and hours of thinking.
Goal: I want to compare data from one list with data from another list.
I retrieve contacts from Pipedrive and get, for example, 5 contacts. Then I retrieve contacts from Mailchimp and get, for example, 3 contacts. Now I want to compare both lists so that I can find out which contact is only in Pipedrive, only in Mailchimp or already created in both tools.
I would appreciate any advice
THX, Johannes