Re: The Doors --156 V6--
Yes, they're the same. I even think the GTA doors are the same but I'd check 1st. The door cards inside will probably be different to yours (depends on interior trim) but they are easy to swap over. Try to get the guy to check if the electric windows still work (and quote him on this if they don't when you get them!) Which just made me think, I guess some 156's may have 'wind-ups' at the back? make sure you get the right type of rear door.
Finally, I'm not sure if the glass tint varies between paint colours? But if you're getting the same colour door, I think you'll be OK.
I got a replacement door for my 156 a while ago, they're easy to swap over.