Chances are the same. The NW computers handle upgrades on NW operated flights ragardless of who sold you the ticket. As long as NW has your OnePass number, they will see your status and upgrade you appropriately.

Edited to add that you also won't receive an email regardless of how you book it. You'll need to view the itinerary online to see if you received an upgrade (phone call will work as well).

[This message has been edited by happymob (edited 04-30-2002).]