Pronet is a bit more flexible on how you set up shared drives and stuff.
I can't remember exactly, but you might use a differently wired cable from a Parnet one??
Parnet also seemed to have a problem when executing files which were stored on the remote machine, it would often bring up packet error requesters. There was a patch to stop that which kinda helped.
I have all the Parnet software here if you need it, I often use it when working with old machines. Not overlay fast, it's about 16k/sec.
Cheaper than ethernet though.