Any potential complication for switching from Watson to Harper?

S applied RD to Watson with Biomedical Engineering major.
He has a second thought and wants to major in either Biological Sciences or Biochemistry.
Is there any complication for his admission process for changing to Harper from Watson?

UW GPA: 3.7 | W GPA: 4.2
SAT: 1500 (790M, 710 EBRW) - 1 sitting
Mostly honors classes. 4 APs - Physics C(cur), BioM(4), Stats(cur), MicroE(4)
Varsity Tennis (3 Years) - Volunteer tutor (3 years)
In state

I mean Harpur

No, it is very easy to transfer from Watson to harpur. However, the other way around is extremely difficult.