between the Continental Reformed vs the Scottish (American Presbyterianism) Reformed?

Last night in our video study, Ian Hamilton made a statement that Calvinism did not have a single expression. He called it the lesson Godly Catholicity. But when it came to discussion we mostly came to the conclusion that he was referring to the 3 Forms of Unity and Dordt vs the Westminister Confession, WLC, WSC. I really do not see those as different expressions as they are so similar.

So, what would you say are the main differences between the two?

John Chaney

"having been firmly rooted and now being built up in Him and established in your faith . . ." Colossians 2:7