From the standpoint of the 8 digit Work Order ID they are same because Work Request is a status for a Work Order.  

A Work Order can be in one of 6 statuses:

  1. Work Request
  2. Approved
  3. Denied
  4. Scheduled
  5. Complete
  6. Canceled

SOMAX differentiates Add Work Request and Add Work Order on the Plus Sign so that Users who are Work Requesters can enter requests for Maintenance.