I think it's possible. I found numerous posts that state they are completely same.
Also I found firmware here ftp://alienware.com/Mobile/5620/BIOS...3.03_CDROM.zip
Can anyone confirm this is the correct one?
A friend of mine gave it to me recently after breaking it's display accidentally. I'm planing on turning it into home server since it is pretty much useless for anything else. I've been searching high and low for it's BIOS update but...