Nothing except who assembled the parts state-side...all have same engine and everything between comparable model and year.
You'll never see a Dodge and Mercedes of the same year because Dodge had a contract with 'cedes to assemble and sell under Dodge name.
When looking at used Sprinters it more important to understand the evolution of their emission controls because they are responsible for both decreased mileage and expensive repairs...to the point that the 2006 Sprinter can sell for absurd amounts. Just saw one sell locally, a 2005 Sprinter with 220k miles, for $19,000.