These are based on my own experiance in recruiting for my company, for clients and in sitting through interviews that my clients took that they ask me to attend. It starts with the perception that part time MBA are non serious, or that the course is not serious in teaching / not enough projects and exposure.
So, at time of screening, hr / recruitment consultants will simply ignore part timers unless they can't find one they want, or if the budget is low.
During the interview (if you are lucky to be called), the interviewer is generally hostile already. In addition, they will ask questions that are more difficult, either because they are told you must experienced and so able to answer. Or that they sub consciously don't want you.
If finally selected, they will offer you lower salary in the light of the thought that you did part time MBA and therefore inferior.
What cuts a different path from this
A. You must be from a premier institute (wellinker in mumbai, jalmnalal Bajaj)
B. You must have experiance and expertise they know you have and they want (where the degree is only ipad iceing on the cake)
Ask any recruiter how many part timers they have short listed, and you will get the source of my comment.