I am afraid I have never seen the second error in which you posted. I do not know how or why Jira would be concerned about this kind of change to this backup file provided you followed those steps as indicated.
I would recommend following resolution #1 of the KB you cited: Project Import fails due to missing projectroleid
If you don't have access to the original database this backup was created from in order to do that OR you simply do not want to make changes directly to that specific database instance, then I would recommend that you spin up a new test instance of Jira with an empty database, and then perform a full system restore (not a project import). By doing this, you can then use this new test system to follow resolution #1 and make these changes to that database directly. You can easily generate an evaluation license for Jira by going to https://my.atlassian.com and I would recommend installing the same version of Jira as this XML backup was created from just to avoid any other complications.
Once you can do this, you can then generate a new backup XML from this test instance of Jira and use that backup to do this project import on your other system.
Please let me know if you have any questions or problems with following these alternative steps.
Regards,
Andy
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