Flight training is flight training. Flying a Piper Warrior is much the same as flying a 747, pull back on the yoke, houses get smaller, push forward houses get bigger, pull back long enough houses start to get bigger again. UND does stress checklist usage (using a checklist as tool and not that annoying piece of paper on the floor) and flows. As funny as it sounds getting used to the concept of flows and how to use a checklist properly (of course the checklist must be well designed, don't get me started) is a big part of making it through your first airline training event.
The structure of UND training is similiar to airline training, specific lessons with specific tasks, certain standards need to be met to move on, etc.
All that being said, UND or any other school, be it part 61 or 141 will NOT fully prepare you on their own for any specific airline or that airline's training events. You will get the basics a few other "tools" you can use but it is ultimately up to you prepare yourself.
As for training before coming to UND, you don't need to and I would advise against it for the simple reason, UND does things a certain way and you will probably spend more money unlearning things and relearning things the UND way. That isn't to say UND's way is any better or worse, just like different airlines or any flight department there are multiple ways to skin that cat, UND does it a certain way.
