From what I've read, it is theoretically possible to carry your urls from one cart or platform to another. That's if you strip out all parameters in the url, like CEON (and the apparently outdated SSU) can. Remove all category/product id's. Remove any ending file extension such as .html. Like on my seo url site here:
http://www.fashion-mart.biz/allure/e...by-allure-a538
So long as the other cart/platform can also do it, it might work.
I think this is the theory of having url's that can last forever, as platforms develop the url can always remain the same.
sph
www.prommart.com
www.fashion-mart.biz