Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
Kyle, the IMEI is phone specific. And it's imprinted on the SIM card HOLDER (not this SIM) in tiny letters. Go see for yourself.
Since the SIM card holder is removable, perhaps this data matrix code is just a more permanent version of the IMEI and/or SN.