If it were not possible, DB wouldn't offer it as a valid connection. As platforms are arranged in pairs, you're not going that far. if you're particularly concerned you can specify a stopover in Osnabrück (at least 1 hour) but that will extend your journey considerably, and it's already 5 hours.
Yes it is easily possible.
The station is a bit special as tracks 1 - 5 are on a higher level going from North to South and the two digit tracks at a lower level going from West to East but the walk is not far and there are plenty of signs to guide you to your platform.
An advantage of this crossing station layout over 2 levels of Osnabrück Hbf is that you can go directly up from platform 11+12 to platform 2+3.
From the viewpoint of a frequent travel 18 minutes is an unpleasant long transfer time for this. You'll do fine.
Thank you so much for your help!
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