You can compare the course content of the BA and BS versions of UNC-CH CS here:
http://cs.unc.edu/academics/undergraduate/ba-requirements/
http://cs.unc.edu/academics/undergraduate/bs-requirements/
Looks like the differences are:
BS requires MATH 232, 233, and (547 or 577)
BS requires STOR 435, while BA allows STOR 155 instead
BS requires PHYS 116 or 118 and a second non-CS science course
BS requires COMP 455 and 550 plus 5 more upper level COMP courses, while BA requires 6 upper level COMP courses
Both require:
COMP 401, 410, and 411
MATH 231