I've booked a ticket on the german db app. Do I need to change my ticket?

The first one is a special ticket, and the latter explanation is "only applicable to special use and refund conditions", which actually means that only one car can be selected, and then how long it takes to refund the ticket or how much handling fee will be charged for the refund; There is a regular ticket at the back, which means "you have complete flexibility and can take every train with a regular ticket", that is, if you buy a ticket, you can take every train from the departure point to the destination this day. The suggestion is that it will be much cheaper to buy Sparangebot in advance (usually more than three days, if you forget more than seven days or 14 days) if you can make a trip. But if you can't decide when to leave in advance, you can only buy an ordinary ticket. However, if you book online, you need a certificate from the European Union or a bank card. If you come to Germany for a short time, you can't buy it. But you can buy it on the train station machine, and you don't need documents to print the ticket directly. The price is the same as online.