No, dimensions do not match the plans. There are always differences. RBM are not final dimensions. A professional job includes measuring on-site.
Yes, that's true...
I still find it "cheeky" to demand a TZ here, even though I would order the kitchen immediately now. I know the problem that arises in the background, but in my opinion, the specialist dealer is obliged to bear the costs here and then add them to new offers... This simply causes extreme unrest and possibly one or the other withdrawal.
Edit: I know this from the perspective of the company I work for - different industry but the same problem. The device is ordered, the price remains!! If the device can only be ordered later or has to be taken into stock and costs arise as a result, we bear these costs! It is also a sign of loyalty, goodwill, and is also expected somewhere...