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
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