Shipping Order Number vs Sequence number vs VIN

look on rad support driver side facing up. It should have same SO number on it. Mine is like 0001 of (eg. 040100001) April 1 right on rad suppoer and on fender tag, I was told it was either the first car off the line of April 1 (suspected) or it was the first ordered somewhere and the production date is an afterthought. VIN was portion of rad support stamp
..."SO NUMBER” The Shipping Order or Sequence Order Number is the estimated day and order the car was scheduled to come down the assembly line. It consists of a three character number followed by a six digit number. The first three will be a letter/number combination or all three will be numbers. This will give the approximate build date of the car...

http://earlycuda.org/techdocs/6265FenderTagDecode.pdf