Okay
the C9 is an older model the tristar is newer typically they put stronger motors in their models as time goes on. From what I can tell the c9 was produces in the 70s and the CXL/DXL Line was introduced in the 90s. I'd find it hard to believe that they wouldn't change the motor in a 20 year span It also has a new motor meaning it's running at the peak of it's performance.
The tristar is not 2 speed the oreck is.
The oreck is a 4 amp machine and I doubt the wiring is incapable of supporting that while most hoses are rated for 2 or 2.5 amps, this doesn't mean it's the cap for them.
Then as stated above we have a slightly larger diameter hose over the normal which grants an airflow advantage. The Direct air fan will also give it an advantage in flow. The oreck's smaller nozzle also concentrates said flow. The Magnesium's brushes are actually pretty stiff too so yes I do believe this setup will outperform what you've described.
