Is this the same display as the 2014/15 models?

Apple lists the two displays with different part numbers so I would say no.

I doubt anyone would have tried using the 2015 iMac display on the 2017 iMac (not the Pro) as the risks ($$) are to great the part of the system could be damaged.

Corrected your system info as now we are talking about a iMac Pro Vs a standard iMac 5K

OK, lets see if I can clear up some of this mess that Linus got him self into ;-}

Let's say you went to a car dealer the day a new car came out and within a few days you had an accident, your hood and left side panel got damaged! Now you drive it to the dealer where you just bought the car and learned they don't have anyone trained yet and as the car is so new the parts for servicing it aren't even on the shelfs! What would be your options? What would you expect the dealer to do?

While I also have a Love-Hate relationship with Apple I've also worked for a few major companies and can somewhat sympathize with Apples plight here with the new iMac Pro.

• Training is always after the product is introduced (maybe limited) and likely just your own people to start with. Training your independent authorized support folks may take from 6 month to a year.
• Stocking of parts often takes 3 to 6 months and they maybe held at a regional depot.

The person who broke the system also appears not to know how to correctly mount the display back on. The correct way is to have it flat on a desk with the top nearest to your self. Taking the time to review the IFIXIT guides as well as any of the Apple service manuals would have shown him this.

The older 2011 and older you could do it this way as they used magnets to hold the display and you used very good suction cups for plate glass to mount to the face. But since 2012 you must lay the system down on its back even to open it.

Apple does need to make changes! First, it needs to offer a means for people to get parts without the hassle of being trained if you already are an authorized service center this is just dumb! It also needs to esablish a 3rd party qualification review process so screens and batteries are validated if you are not going to offer them out directly to anyone who asks for a part.

Just like cars I can go to a dealer and order the part I need and do the repairs myself. I take the risks if I mess up.