The srt has the adjustable suspension, and the 6 piston brembo brakes, 9.5 inch wide srt wheels standard plus the full srt pages. Also Option for full leather seats. These are all things that don't come on the 392 scat pack except the brakes and wheels- they are part of the dynamics package.
SRT has adjustable suspension and track mode and performance pages with a different seating stitching. It all depends on what 392 you are talking about. plain RT only comes with the 345. If you get a Scat pack or 392 Daytona then your a bit under a SRT. A scat has the bilstien struts and lowered suspension with 4 pot front brakes. The daytonas are different. If you have a 345 daytona you just get the daytona seats and stickers. If you get the 392 daytona you get it all. Bilstiens, lowered suspenstion, 6 pot fronts, stickers and seats. Im sure there is other stuff