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USDZ (Universal Scene Description Zipped) is a lot more than just a 3d model. You first need to extract the USD file from within the USDZ, but thats still cameras and environments etc.
I would suggest using Unity to import the scene, then selecting the assets you want, and exporting those instead. OBJ filetype would be easiest exoprt option from Unity to Rhino.
I've never heard of this file format, i just had to look all this up. look like its main use is Apple device-geared pixar VR projects?. If this isn't your game asset, you may want to check if you are allowed to convert it.
It really depends on how much of the first is textures over flat volumes and how much is actual volumetric detail, I guess. It could also have to do with the conversion details, dunno.