So their orders are in the same boat as, say, the SSPX?
Well, in a way. The difference is that the PNCC (nowadays they often drop the first word, in the US) acknowledges that it is, in fact, a separate denomination. They have laity, pastors and bishops-ordinaries, in charge of their own
dioceses. The PNCC don’t maintain they are part of the RCC. The SSPX has no actual laity, they have no pastors or parishes, just chapels schools and retreat houses. There are no SSPX bishops ordinaries in charge of any diocese of any kind. Their bishops and priests are just sacramental ministers.
It seems to be a disputed point as to whether the SSPX ** organization as such** is part of the Catholic Church in irregular status, as its supporters claim; or if the organization has no ecclesiastic status at all; but most if not all their clergy
as individuals would be considered as in the RCC, but unassigned, and acting illicitly. The situation likely would vary from person to person. The SSPX would not recognize any bishop as ordinary of your diocese of Buffalo. They do recognize Francis in some way as their pope. The PNCC recognizes Francis as the RCC’s pope and Bishop Malone as the local RCC bishop ordinary; but they have their own bishop ordinary for that city.
The SSPX of course has the same 7 sacraments as RCC. The PNCC lists 7 sacraments; some websites list the same “Roman” 7. But other websites or churches vary a little - they combine Confirmation and Baptism as 1 sacrament, in 2 events; but add a sacrament for “Hearing the Word of God”. I suspect that one trend is replacing the other, but you can find both if you look around.
To my mind, the local SSPX clergy, if any, are in effect defying the local RCC Catholic bishop Ordinary. They local PNCC clergy would likely not consider themselves defying the RCC bishop, (or the EO bishop, the Anglican bishop, or any other bishop); they are obedient to their own totally separate ordinary, and hierarchy.
The best place to find out about the PNCC, and SSPX, is from those people themselves.