possible....but i've clipped the C2 on everything from jeans pockets, files, belts, and the clip has been holding up fine whilst doing a great job.
it seems like the new clip was designed with the addition of the lanyard attachment point in mind. as for the shape, i suspect they changed the shape of the clip near the bend so that whatever the light is being clipped to can be inserted into the bend as well. with my C2, whatever i clip it on gets stopped at at the base of the attachment point due to the shape of the clip. i have to admit the newer clip does look better too, so aesthetics might have also been one of the considerations.