Ugrade PV600 (RS-232 DH485), comm.to ML1500, to PV+

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Hello experts, There's an existing PanelView600 (2711-K6C5 which has only RS-232-DH485 communication port) communicating to a MicroLogix 1500 (it seem to be an LRP processor since the serial communication is connected on the CPU left side) via female-female 9pins ribbon cable (used all 9 wires that I tested just straight-connect). Now my questions: 1) I read that I can upload PV600 project direct to laptop w/serial port using also straight connect 9pins cable (using just pins 2,3 and 5) and 1747 PIC/AIC+ driver on RSLinx. Could I just use the 9pin straight ribbon cable (using all 9pins) currently used by the PV comm. to ML1500 (unplug port to ML1500 then plug to laptop serial)? 2) Could I also use this same cable to upload ML1500 program (unplug PV600 port then plug to laptop serial)? 3) The new PanelView Plus 600 is a 2711P-K7C4A8. Could this new one also used that old same ribbon straight cable? I checked that this PV+ basic RS-232 port could also handle DH485 protocol and I also checked on a manual named "Legacy PanelView to PanelView Plus 6 Catalog Number Conversion" that it seems it's the particularly the correct counterpart of the old PV600, which also particularly emphasize the comm. port (RS-232-DH485). That's exactly what this is supposed to mean right, namely that the 2 panels have similar communication port, hence no need to modify anything on communication (esp. hardware/cable) right? I'm worrying because the plant guys said that those previous conversion, the other guys wasn't able to use the same ribbon 9pins straight cable from ML1500 side port to new PV+, instead they had to use the round port of the ML1500 and then used cable with some converters along the way before reaching the PV+. What do you think? Any inputs would really be appreciated!