Identical, they are one and the same item, only difference is the price and the TT stickers on.
However when I come to get a full face I am seriously looking at this one http://www.amazon.co.uk/SIERRA-ADVENTURE-MOTORCYCLE-MOTORBIKE-TOURING/dp/B00JBANIWM
some very good reviews, and as I have a flip front shark I only want a full face for occasional use.
Looks like a lot of lid for the money... but is that chin a little low, making life savers hard? An issue for me as I don't run mirrors on my dirt bike!