What is different about Saint Patrick Catholic Church as opposed to a Polish National Catholic Church parish? Why were they accepted and not Saint Patricks?
There is no fundamental difference between Saint Patrick Catholic Church and any Polish National Catholic parish. Their establishment is identically legitimate, both churches coming from Roman Catholic lineage of hierarchy. The only difference between the two is that the Polish National Catholic Church is a relatively large church, and, to be frank, the late Pope John Paul II was of polish ancestry. In short, the only difference is political.