Key will not be imported, it is generated by JIRA according to the project you are importing it into. If you specifiy and map a key in an import, then the import is treated as an update to an existing issue.
Documentation here: https://confluence.atlassian.com/adminjiraserver073/importing-data-from-csv-861253680.html?_gac=1.220783338.1506009482.CjwKCAjwxo3OBRBpEiwAS7X62dTz2lusHVQ41uP63-z1wfwDhgOFfw4NcF_f-RbyoaGUTCSjXSNg2BoC5SYQAvD_BwE&_ga=2.143264757.1309587125.1506348434-2139828892.1496244810
You might check the market place and see if they have a tool that will meet your need. A quick search brought this up and it might work for you. https://marketplace.atlassian.com/plugins/com.awnaba.projectconfigurator.projectconfigurator/server/overview
@Kalai It is still the case. You just need to make sure that you map the key if you would like to retain it. I have migrated issues over to new projects and retained the key by mapping it in the CSV import. Just make sure that the key is not already being used and you will be good to go.
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