Since this involves a different visa from the F-1, it may be advisable to consult an attorney. Actually, if the application and change to working status is made while in the U.S., a visa is not actually issued. If the person leaves the U.S., then an application must be made to a U.S. consul to have a new visa issued. The rules for working visas are quite complicated and no two situations are the same. It is advisable to consult an attorney experienced in immigration matters before making any commitments or applications.
Immigration law is complex and unhappy surprises are common.