VIN number mismatch

I recently purchased a 1971 pushbutton Pantera #1252. I found the VIN number on the pedal foot box is THPNLK01252 but the VIN plate on the dash just read DTx01252x. Do trying to get this registered at the DMV was a real headache. I called several experts from PIM, Hall pantera, Wilkinson pantera and they all said the VIN on the dash should match the VIN on the pedal box. I recently talked to the previous owner who was very knowledgable about early panteras and provided two other pushbutton panteras with #1116 and #1256 who have the shortened variety of the VIN number. I just thought I might post this so you can see how the very early panteras have dash plate VIN that are different than the one in the trunk.