Sometimes that's just it - the difference is in the name only.

That's why it's important to check the course content before signing up for a postgraduate course because different institutions may give different titles to their programme to attract potential students.

Besides that, I think some Master in Management courses are specific to one area or sector eg IT or education as you found out. MBAs are more general courses and it's principles are meant to be applied across all sectors.

If you have further questions about postgrad studies, I suggest you log on to postgradasia.com as they have experts to answer all questions relating postgrad study.