http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2677445

Spanki and I have been working on a Python script for this purpose.  It does successfully transfer morphs between actors with different geometries.  The process may be slow, depending on the resolution of the meshes involved, and the quality of the resulting morph will depend on the quality of the source morph.

The script is still in development, but these basic features are verified.  See one of the later pages of the thread for a recent post of the script.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.