2003/04 ECM in a 2005 Excursion ?

[Gary Slahor]

Complete NOOB here, so pardon the silly questions..........

I'm trying to round up a spare ECM and a spare FICM to send in to PHP for reprogramming to minimize my down time.

1. If it's going to be completely reprogrammed anyway, is it acceptable to use a 2003/04 ECM and reprogram it for my 2005 Excursion 6.0PSD ?
P/n for the 03/04 ECM is FCM-122.... 3C7A-12A650-HM.

2. I just had the truck in the dealers shop and it was completely reprogrammed with the latest version software as of Dec 15, 2010. How can I determine what verasion (strategy?) of the software I now have? I don't have a code reader or tuner (yet).

Many thanks...........Gary