When you board the plane they check the codes to see if you have been through special screening, they check the markings to the boarding pass codes.
I've made it to the flight a few times only to be turned around and accompanied back to security for the full security theater experience. At this point they will check the list and you will be arrested if they find a problem in the paperwork.
Your best bet is to change your name slightly William --> Bill etc. and play around with a middle/first initial. Computers are dumb. TSA agents are friendly when you are friendly to them and have tendency to not pay attention to their work. Social engineering is a lot more effective than computer hacking.