Some of the differences are that the Master's of Product Management (MSPM) has a much stronger emphasis on HCI and User Experience Design, and is on a different cycle. That is, the MSPM runs from January to December (1 full year, off cycle), whereas the Master's of Software Management is on the regular cycle. The MSM is also available for part-time students. Lastly, the MSM has a stronger focus on being an engineering manager, though there will be some overlap with being a product manager.
http://www.cmu.edu/silicon-valley/academics/software-managem...
Some of the differences are that the Master's of Product Management (MSPM) has a much stronger emphasis on HCI and User Experience Design, and is on a different cycle. That is, the MSPM runs from January to December (1 full year, off cycle), whereas the Master's of Software Management is on the regular cycle. The MSM is also available for part-time students. Lastly, the MSM has a stronger focus on being an engineering manager, though there will be some overlap with being a product manager.