Marie Rose and Thousand Island are very similar in a lot of ways. They both use mayonnaise and tomato sauce as their base and often have many of the same ingredients including Tabasco, Worcestershire sauce and lemon juice. In fact, many people think them to be the same thing, although there are a few subtle differences.
The differences lie in the fact that Thousand Island sauce originated in America and can often contain other finely chopped ingredients such as garlic or onion, unlike the traditionally smooth Marie Rose sauce.