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Reimport data from unistalled apps

My question ist twofold and I am really looking forward to any help.


I have a package that has dozens of custom objects with references to standard objects like opportunities and Chatter feeds. I need to uninstall and reinstall (with a slightly changed schema) this app. 


I read that the data zip that is created after uninstalling contains all data as csv that can be reimport with the dataloader and other appexchange tools (Informatica, Skyvva,...)


Question 1: What happens to references to existing standard objects and Chatter feeds related to the uninstalled custom objects?


Question 2: Can you suggest a simple and cheap way to import automatically all those interelated objects from the csvs in the zip?


Thanks in advance.