Height of the Tourneo Custom

Hello I’m hard to think of buying a Tourneo Custom. First test drive with a model from 2016 was very convincing. He also came into our underground car park. Now I have read that there can be the Ford with different wheels:https://media.ford.com/…/…n_Ford_Transit_Custom_vorl%C3%A4ufig.pdf (In the area of turning circle there are different rim variants) For a 15/16 or 17/18 inch. Unfortunately I did not know this at the time of the test ride and therefore currently the seller is on vacation so I can not ask… now I wanted to get rid of a few questions here, you can know a lot more about it: 1. Change 15/16 or 17/18 inch rims the height of the vehicle, or are the tires then “flat” ? 2. Can I easily mount the smaller 15/16 inch rims with a bus equipped with 17/18 inch rims (to reduce the height), or can I not w eil…no idea am no screwdriver 3. Do the two Tourneo Customs differ in height or are the same in terms of the theme (i.e.Tourneo Custom BJ2016/ “The New”Tourneo Custom BJ2018) Thank you for your help.