Where intended major does matter in terms of frosh admission decisions (e.g. applying to the CS major at CMU), it is typically the case that changing into that major later requires a secondary admission process (e.g. to change into CS at CMU, students need a 3.6 prerequisite GPA and 3.0 overall GPA, but admission is still competitive and not guaranteed even then: https://www.csd.cs.cmu.edu/content/guidelines-transfer-dual-degree-minor-and-double-major-cs ).