On the K3 software upgrade page, Amazon distinguishes between the US & Canadian version - serial # begins with B006 and the European K3 - serial # begins with B00A (for the 3G models). If they require different updates, there must be a difference in the software on the devices, if not the actual devices themselves. I suspect it has something to do with which 3G networks they use since there is only one universal update for the wi-fi only K3.
But since Zipper 104 is from Canada and wants to purchase in the US, it should be OK even if it's the 3G model.
