First, so glad you’re interested in Clemson. Great place to be!
Second, best place to analyze stats is the Common Data Set:
http://www.clemson.edu/oirweb1/fb/factBook/PastCDS.html (or search the clemson.edu site for “Common Data Set”.
This information is gathered by every college and shows the breakdown of key categories for applicants. I imagine you will find your answers in this data. (And it won’t hurt to get accustomed to doing some research… if you go to Clemson chances are you’ll do a lot more data gathering and analysis before you graduate!)
In general, OOS is harder than in state. In general, EC’s are not as important as core stats… SAT/ACT and GPA.
Good luck! Go Tigers!