Hi Mark.
The trial and student builds are NOT the same file.
The Trial is the 2012 SAP build (with slight changes to disable commercial licensing), while the Student version is the 2012 Service Pack 1 build, which was released a few months before SAP and doesn't include any of the SAP enhancements.
Hope this clarifies things.
Cheers,
Robert.
Autodesk M&E Support
http://www.facebook.com/AutodeskMECF