Illustrious 18 indicies

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Newbie here. I've been at this a couple months now, haven't played at all, just reading and studying. My main source material is/was Professional Blackjack. When I was making flashcards for the Illustrious 18, I pulled the indices from wizards of vegas. I've now got my copy of CVBJ and I was working on some of the flashcard drills. I now notice that the wizards of vegas and Professional Blackjack vary on a couple of the indices in the Illustrious 18, namely 12 v 5, 12 v 6, 13 v 2, and 13 v 3. They are all off by one from each other. I imagine the difference is very slight, but being new and wanting to do things as well as I can to start, which one of these sets of indices should I be using? Thanks for the help in advance.

Chief, you can use either without fear of loss. You can actually mix and match from both lists to get the most easily memorized list. The "right" index for a play is hard to pin down, and a difference of 1 from each other won't have an effect out on the battlefield.