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Hi @wireduk,
Thanks for reaching out! And thanks for willing to use our plugin instead of that other one. Each plugin handles authorship data differently, so yes, if you activate our plugin and deactivate the Co-Authors Plus plugin, those multi-author posts you have now, will become single author posts.
If you feel comfortable using the WP-CLI, we can provide a tool to migrate from Co-Authors Plus. The tool has no interface – it is just a CLI tool. And it only deals with authors who are actual users (no guest authors).
If you have just a few multi-author posts, it might be better to just go edit those few posts and add the authors.
Please let me know if you want use to share the CLI tool with you.