I don't fully understand what you read somewhere, but I will provide you with 2 answers.

1, The Vin # posted on the front of dash on drivers side, should match the Vin # posted in the door frame of the driver side.

2, your question is much appreciated as I will add some future content to the website about how to read Vin #'s, such as, the 10th diget tells the year, the last 6 digets tell the production #, all other #'s have input such as , engine size, model, trim,