I could be wrong but I thought the sideskirts are the same between the kit and thre SRT stock. But just look like there lower due to the lower suspension of the SRT.
After I got my Mopar body kit I have been telling people to buy the whole kit instead of the SRT side skirts because it comes out cheaper for some reason. The side skirts are the exact same, I have been parked next to a few SRT's, and they are the exact same skirts. Get them already painted if you can, much cheaper than having a shop paint them, I paid $300 to have my 3 piece primed kit painted Brilliant Black Crystal.
I have to admit, getting the whole Mopar kit the front air dam painted does make the car look much better. The shape is only a slight difference, but with it being painted to match the car and at the sides it flares out a little more than stock is cool. Before you buy either kit just do a cost comparison, remember if you get the primed kit it has to be painted which raises the final price, unless you paint it yourself which I would do now since I have a good compressor and a good paint gun.
Did they sell WK's with the Mopar kit already installed? About a month ago I saw an older woman in silver WK with the mopar kit on it, and I doubt she went out and bought it aftermarket since nothing else was done to the car. To me it stood right out with the wider painted side skirts.