Princeton claims to offer all students, including engineering students, a “liberal arts education.”
https://admission.princeton.edu/academics/what-does-liberal-arts-mean
I agree. While they are both LACs, CMC and Pomona have different approaches across the board, each with its own focus and personality. CMC has long emphasized its own particular approach to economics and government, and this has been very important to the “flavor" of the institution as a whole, even in its motto: "Civilization prospers with commerce.”
Economics is the largest major, but surprisingly (to me at least) there are a lot more “STEM” type undergraduate degrees awarded (131) than “business" type undergraduate degrees awarded (89.)
Hopefully contrasting CMC and Pomona might get us back to your original question, and something @EconPop noted about the size of organizations. There is no single LAC flavor, and it may be easier to create and maintain a particular ethos if the educational community is of a certain size.