[Koha] importing mysqldump into newer version

Hi there, Well, I recently lost my koha installation 1.2.2 I would like to install version 1.2.3 instead and I wonder if it is possible to directly import the mysqldump made with 1.2.2 into the newer version 1.2.3 what would be the operations to proceed ? or would it be simpler to reinstall 1.2.2 and then upgrade ? thank you. Philippe R.