I haven't checked out the Challenger Kits but when you get going I could give you some reference shots from my 2012 RT Classic.
There are some external differences starting in 2011. The door handles were changed and front end fascia is different. The lower intake at the front changed from a "smile" to a "frown". Nose badge also was eliminated. The "ram" type wheel hubs were replaced with Dodge name. Also there are different sets of wheels as options.
I think the kits that have been produced are 2010 models or older.