Had a quick look around.
What appears to be the only difference is that the UH has a more traditional looking front to it, and sports a white stripe.
Whilst the CH has a glossy black front to it to attract finger prints. Looks nice if u make sure no1 touches it
Specs ~appear~ to be the same. Prices in the US seem similar, although the CH is discounted so may have been $30 more for the smart front.