I think the ranch has a very good comparison of the two exams.
I consider
Java 8 a game changer: lambdas bringing in a functional-style of programming.
It is already having a profound effect on how the language is now being used, and it would surprise me if this is not reflected heavily in the certification exams.
A cowboy should know how to cast a lasso. A Java programmer should know how to wield lambdas.