This is a dead-end station, so 13 min. should be fine but if there are train delays, what will you do? Is this for a regional train or an S-bahn or an ICE? There are 24 tracks here, so you are walking from one side to the next.
I would make sure you are at the very front of the train, go ahead and walk through 1st class. Once you get to your new train, you can get on the first car too and walkthrough. Just make sure it is the correct train though as they sometimes switch tracks from what is scheduled. They are doing tons of construction everywhere in Germany and it affects the trains quite a bit.
Where are you coming from and where are you going?