Seriously mate have you ever seen a Pastel Sugar?
http://www.constrictormorphs.co.uk/available.html
The Pewter Sugar you have up on that page is not what I would think a Pewter Sugar would look like, but age would say everything about that animal.
This is what a True Pastel Sugar looks like:
http://www.exoticsbynature.com/daytona07/kahl5.jpg
http://www.exoticsbynature.com/daytona07/kahl6.jpg
http://www.exoticsbynature.com/daytona07/kahl7.jpg
http://www.exoticsbynature.com/daytona07/kahl8.jpg
http://www.exoticsbynature.com/daytona07/kahl9.jpg
I've also saw a few at the Daytona Show that look similar if not considerably more whacked out. There are other Breeders there in the UK you can double check this information with.
But Between the "Sugar Cinny" & the "Sugar Pewter" I think the Pewter is more likely to be a Sugar than the Cinny.