Best practice would be to do a library BACKUP on the source machine. Copy the resulting zip file onto the destination machine. Do a library RESTORE on the destination machine using the zip file. Be aware this copies everything, not just the record rules.
I do recall you can view an XML of the record rules of a given machine at the following location:
C:\Users\User\AppData\Roaming\J River\Media Center 31\Library\tvrecording.xml
But I have no idea if doing a copy/paste of that xml file from one machine to another will function properly.