No, you do not need to create a new project. A board (Kanban or Scrum) is just a view of the data in one or more Jira projects, based on a filter query.
You can create a new Kanban based on your project, or you can first create a filter to just show the issues/issue types you want to show on the board, then create a Kanban board based on that saved filter.
If you want to you could then delete your Scrum board. No board creation or deletion has any affect on the project.
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