I just did so. Had to rotate due to the removal of the OEM cross over pipe to a custom cross-over tube.
It didn't like to rotate. And, I had just put this turbo togerther less than a year ago. Yes, there is a gasket. It's a quad ring. The aluminum comp housing fits very tight onto the back plate. It wanted to turn slightly, but not enough. You may get lucky... ... ...
I had to pull the comp housing off. I removed the seal and reinstalled the housing to allow me to rotate it frequently during the "mock-up" of the new tube.
And yes, that band clamp is all it takes to loosen the compressor housing.