I bought the first one, and I haven't studied it in great detail yet, but it seems to be more like lesson plans. It has a list of books and resources for each age grouping and breaks it down into weekly plans. It breaks down the grades a little differently than WTM does, not starting grammar stage in first grade. Since we are just dabbling in K right now, I got some of the books and we are starting slowly, just doing reading and phonics and music every day, and everything else is done for fun, when the kids need something to keep them entertained. I think it will be more useful to me when the kids are ready for more formal schooling. And I think the 2nd one will be more useful in terms of resources, since Catholics have more issues with the curricula when studying medieval/renaissance.
If you are looking more for lists of living books, there is a 2 book series called Keeping It Catholic, and the 2nd one is only about history, with lists of books for the different time periods. I think that is one of my favorite resources so far, since the Catholic perspective is very important to me. (We are on the more traditional side and attend an FSSP parish.) There are some old Catholic history textbooks that are reviewed in the history volume of KIC that I think you could use as read-alouds, similar to how you would use SOTW. We will be using some of those when we cover the Reformation era. I'm just getting started at this, so I'm by no means an expert, but my college degree is in history so this is my favorite part of the curriculum. You can get the KIC books from Adoremus books online--they are published by Neumann Press.