It seems like in the new book she left out the underage girl K/Meri were grooming before he married Janelle. But she did add an early potential fourth wife who was about 19 a while after Christinejoined the family. I don't know if this is the same girl or not. If she was the same girl, that would somewhat fit with what K said at the S18 tell all about how Christine prevented him from marrying a woman he had been pursuing since before marrying Janelle. But this is presented somewhat differently since Christine presents herself as accepting of this potential fourth wife while she didn't want to be in the same family as the underage girl.
Its also interesting how differently Christine describes the first time she hears about Janelle. In Becoming Sister Wives, she finds out about her because K vents over his frustration at Janelle driving him crazy before they got engaged (she was dating other men). In Sister Wife, Christine depicts herself finding out about Janelle after she and K became engaged. I wonder why she changed it.