After checking a couple different Magazine Test Statistics of both the NA Crossfire, and the SRT's, here's what I found.

10/03 Road & Track -Ground Clearance.... NA Crossfire Coupe 4.9"----Hight. 51.4"

8/04 Car & Driver-Ground Clearance......SRT6 Crossfire Coupe 4.9"----Hight. 51.5"

Since both cars have the same ground clearance, I'm going to assume the SRT's greater hight comes from its owners inflated ego.
Or the NA drivers deflated one.