Why is BHM a 4-years course and B.Sc in hotel management a 3-years course when both are generally the same?

BHM 4 years and B.Sc in Hotel Management is same as such. But, here the difference is you have 6 months industrial and specialization for other 6 months in BHM. Wherein, B.Sc Hotel Management only gives your training and education without Industrial Exposure. People tend to choose BHM to get industr