I rely on Galula for the four changes as he lays them out in his classic. I don't have my copy handy (hopefully it is getting passed around at SOCPAC and PACOM doing good duty, but is probably in somebody's household goods gathering dust).
Off the top of my head, he started with land reform, and ended with land reform, I need to see if I can find what versions 2 and 3 were. He wasn't afraid to change tactics when one wasn't working. He also tried to follow Lenin's guide at first and have a city based worker's revolt, but China was too rural so he switched to targeting the peasantry for support.
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