Once you connect external pull ups to the port p0. which is done in almost all uC cases when you don't use external RAM/ROM. all the ports are identical as far as simple I/O is concerned all have pull ups.
Not quite, P1-P3 has the little strong pullup transistor that is engaged briefly at 0-p1 transients. Thus you can get a sharp 0-1 transition on 1-3 but not on 1.

Erik