Not as the key on the Jira issue.
The CSV import is sequential, so if your external system has (say) ABC-123, ABC-125 and ABC-126, you could import 4 lines of CSV - plug the hole at ABC-124 with a dummy issue and delete it later. But bear in mind your project key will need to conform to Jira standards.
Most people doing imports have a text field for catching the original issue trackers unique id as well though.
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