When you get the Ticket from the Ticket Machine (thats a little Tricky) so your Name is on the Ticket but the Staff dont care about.
Yesterday i take 4 different Trains white a 0€ Ticket (special Ticket) and normaly i have to show my "Österreichcard" instead of the ticket but nobody care about...
At least I know that the Prague-Vienna leg of my itinerary is the only one that I booked with "Giuseppe". Every other ticket is "Joseph"
So its important what kind of (online) Ticket an ÖBB, and CD or DB?
(In the future is often Cheaper when you book a Ticket in CZ and another in Austria from / to the Boarder Station)