Is it easier to make it into MIT’s Sloan School of Management compared to MIT’s other colleges in programs for undergad?
No. Applicants are admitted to the school, not a department.
Just to clarify a little. “Sloan School of Management” is typically referring to the graduate department. Undergrads would be in course 15, management.
Undergrads admission is to the school without regard to department. Grad school admissions are by department.
The OP kind of had the two mixed up.