One last bit on White. I know the OP wasn't necessarily interested in their involvement as much as he is interested in the specific history of the PP325.
Well I think that this twist may have some info to that history as well.
Actually I think I found a pattern here, and your theory may have some merit to it.
White industries was aquired in 1986.
Doing some digging around on Akers site, it seems the end of the Pioneer/Partner names ended in 1988.
You also think that the Poulan Pro brand wasn't introduced untill 1988.
It seems that with your thinking of White being in charge of marketing the Poulan's and your article on White showing how they liked to streamline things, it maybe more than a coincidence that they decided to use the more US recognized name of Poulan to market there Pioneer/Partner saw's. The models 325, 405, 525 and 655 come to mind.
The Poulan Pro branded Jonsereds like the 425, 445 505 etc, seemed to appear starting in 1993.
The Poulan designed Poulan Pro's like the 305, 335 were introduced in 1988 also and I'm not totally sure on there purpose except maybe a stop gap measure.
I ,mean why would they bother keeping the Partner based 325 around when they had the like sized 335 out at the same time?
I got to think about this some more.