There is a difference in class size between honors and regular sections. Here are the current enrollments for Spring 2017, honors/reg, respectively:
Calc I: 36 / 90
Calc II: 48 / 116
Calc III: 48 / 86
Diff EQ: - / 62 (no honors section)
I will say, these bums-on-seats #'s have changed a bit over the years. By comparison, here are the enrollments for Fall 2012:
Calc I: 51 / 88
Calc II: 50* / 75
Calc III: 30 / 47
Diff EQ: - / 48 (no honors section)
*(Honors Calc II is for Spring 2012 instead, because not offered in Fall semester at that time)