https://cs.lsa.umich.edu/prospective-students/advising.html says that LSA students need to earn a 2.5 GPA in the four prerequisite courses to declare the LSA CS major.
https://advising.engin.umich.edu/declaring-or-changing-major/ says that engineering students can freely choose their majors (2.0 GPA required).
Choice of LSA or engineering presumably can matter for admission selectivity.