I created this list from something started by another member of the TYP356 Northeast club and expanded on his list after he held a "Tech Session" where we did a side-by-side comparison in his shop. Most of the other members saw the session as a curiosity, while I was taking notes like crazy with hopes of creating this table for my own use.
There are a LOT of other mechanical differences, but I thought these were most pertinent to the Replica crowd (things like seat mount placement don't get us replica guys excited, but it REALLY gets the PCA guys juiced!)
I may still have the original, more mechanical list that Rich created kicking around so I'll look for it and scan/email it if I can find it.
Hope the rest of you enjoy seeing how new product management hasn't really changed much from the early days of cars to the current computer biz - subtle things still get phased-in when we think nobody else is lookin!