Usually it's that the P4 version references .bum files for the bump map, whereas PP used .jpgs. Since often the .bums are not packaged, and P4 needs to convert the jpgs into .bums, I usually pick PP for Poser 5, and delete the P4 versions (which saves me clicking on them in error and then sending poser into a hissy fit while it tries to find 14 .bum files that don't exist.)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire