Dear @Marcus Wong Theen Nam ,
Thank you for your post in our forum.
Restore from a newer version to an older version is called Backward compatibility that not supported in SharePoint as well as SQL Server.
Only Forward Compatibility is supported. otherwise, you will need to use a 3rd party migration tool to can restore to an earlier version.
Should you have any questions or concerns, please do feel free to contact me.
Yours sincerely,
Renjie Sun
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