Zen vs Advanced Omega

I've been using the Zen Count Strategy in the back of Snyder's Blackbelt in Blackjack for the past few years.  I'm also studying the Advanced Omega 2 Count Strategy.  I don't understand why the AO2 7.1 Table numbers are different by a factor of 4, in comparison to the Zen Strategy Table.  Example, when holding a 12 vs Dealer 6, the Zen Table has player hitting at true count less than -4, but the AO2 table has player hitting at true count less than -14.  The Zen and AO2 counting systems are very similar, but the strategy tables are very different.  Why?

Probably divides RC by quarter decks instead of full decks?

Thanks RS, I've been going in circles trying to figure it out....... Snyder uses 1/4 decks which he explains in Ch.8 of Blackbelt in Blackjack, and Carlson uses full decks in Blackjack for Blood. Thanks for pointing me in the right direction.