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:
- Work Request
- Approved
- Denied
- Scheduled
- Complete
- 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.