You wont have no trouble replacing this dishwasher at all.
As all built in dishwashers are the same size. As they are made to fit under units so it doesnt matter which brand of dishwasher you get weather its Neff, AEG, Hotpoint they are all the same and will fit in the gap were your old dishwasher went.
So you wont have any trouble replacing this with a new one as which ever you go for it will fit into the gap you have.
Hope this helps, If you need anymore info just get back to me.