The Universal Poses attempts to apply poses across all models regardless of vendor, and you will encounter some bizarre distortions every so often.  If you really need to duplicate the pose exactly, I would recommend Puppet Master.  I use both methods, universal for quick posing within the scene and Puppet Master if I absolutely going to save the pose to my library for reuse.  This works great with partial pose creation where you build your pose using one model and afterwards convert it to another.