Tickets are for a route, not a train. So normally those details are entirely irrelevant. You will for example not find trains numbers on departure boards in stations. What you need to make a not of is the depature time, and the destination of your train. That is how you find it.
What you see when you look up train times on the website is first the line number, and it will be on a red background.
So you see for example IC1. There are multiple IC1 services throughout the day, that each have their own train number.
So if you click on the train label to see the details of the train you will see for example that yours is IC1, train nr. 711. You will however not encounter that train number anywhere in a station. In the station you will be looking for a IC1 with your departure time.
Your ticket probably mentions IC <space> 711, and this is because you bought a supersaver ticket where, different from the default, you are indeed expected to be on train 711.
But you can ignore those train numbers. Check departure times. That is how you get on the right train.