JIRA Issue numbers when moving between projects

Question

Two questions: If I have an existing project and create a new empty project, then bulk move some issues from the old project, will they keep their issue numbers if possible? Eg. OLD-123 -> NEW-123, or would it be OLD-123 -> NEW-1

Also, if I change the project key OLD -> NEW, will the issue numbers stay the same?

Mike Sorensen · Accepted Answer

This is an easy test you could run with little consequences. However, I've done this and can tell you.

A: You'll get OLD-123 -> NEW-1 but OLD-123 will still be valid for hunting purposes. If you ask for OLD-123 you'll be redirected to NEW-1.

B: I've never changed a project key and can't answer that question. I expect the issue numbers to be the same. If you have Admin rights this is also an easy experiment where you simply erase the old projects and everything is fresh.