You would need to replace *all* the Moodle code as there could be lots of other problems related to the script code. If you do that, make sure you have backups and make sure you keep the config.php file as it will have the database credentials and the 'dataroot' location for files.
It's still hard to be 100% sure if it would work without problems.
Don't use Softaculous, Bitnami and whatever else is out there to cause confusion