Steering wheel control buttons...? Nav vs No Nav.

[Jayhovah]

I am upgrading my base stereo with aftermarket and would like having the hands-free calling buttons on the steering wheel... so I am going to try and replace the steering wheel buttons with ones meant for the bluetooth model and see if my SWC adapter will recognize the additional buttons. As far as OEM parts go, they are very reasonably priced at ~$60.

There are three part#s to choose from for my '13:

25550-9N00A "W/BLUETOOTH, W/O NAVIGATION PKG."
25550-9N00B "W/BLUETOOTH, W/NAVIGATION PKG."
25550-9N00C "W/O BLUETOOTH"

Link:
STEERING WHEEL & TRIM for 2013 Nissan 370Z

My question is - is there a visible difference in the buttons between the "with Nav" and "without Nav" parts? Some additional buttons? Most likely I will be ordering the first model which specifies without Nav, but I was curious.