Is there any technical difference between this Logitech Brio Stream and the Logitech Brio 4k Ultra? I've searched the internet and the Logitech Sritech and can't find any differences except in price. In particular, on the Logitech site I can only find a useful technical specification for the Logitech Brio 4k, but not for the Logitech Stream - so no direct point by point comparison is possible.