They are slightly different. You can find the dimensions on the Tunze website:
http://www.tunze.com/usa/index.html?lang=en-gb
You can kinda tell it's a German site translated into English but if you navigate around you'll eventually hit upon the Stream models and dimensions.
Interestingly you can't find any info on the soon-to-be-released products but if you surf through the MO vendors like premiumaquatics you can get a general gyst of the features.