I'm guessing the one on the left is an SXT with a wheel/rims upgrade (they look an awful lot like the 18" one's in the pic of the silver R/T that was posted here in the forum first - then at "autoblog" - I think) in the Dark Titanium Metallic finish. The fuel filler door isn't chrome, and I don't see a spoiler.

The red one on the right looks like it's sporting a chrome fuel filler cap......can't tell about a spoiler. Possibly an R/T?
I think the R/T will come standard with 18" rims, and a 20" upgrade option. I believe the SXT will come with 17" standard and an 18" upgrade option.