No two monitors are ever going to be exactly the same. I have two Sharp 19" LCD's on my workstation at home. Both were purchased at the same time (the serial numbers are only off by 5 so they were manufactured at about the same time) and both are running off of the same dual monitor video card. Both have been calibrated and are using the correct monitor profiles. And there is still a slight difference in color appearance between the two. When you add different computers, monitors and video cards/drivers into the mix color matching just gets worse. Wait until you try to add printing to the mix. It gets even more fun.