The UV mapping is part of the .obj file.  You would first remap it and then make a copy of the cr2 and, using a text editor,  change the two .obj references to point to the remapped one...

 

EDIT; the native Poser files are compressed, so you will need to decompress .obj the .obz file for whichever figure you are using before you can remap it, and the .cr2 from the .crz before yopu can edit it.  There is a script on the Scripts menu to do this, or you can do it in 7-zip...

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