As for the RS Gauge swap, I'll try my best to explain what it is. Tons of non RS Cruze owners even know what it is.

...The RS interior gets an uplevel instrument cluster, replacing the standard silver finish with chrome accent rings as well as opaque cluster bezels that allow the cluster’s ice blue backlighting to shine through. GM says that this provides “a sporty nighttime appearance.”
This is pretty much the difference between the clusters.

Here is RS



Here is what all the other trims besides Diesel and LTZ get standard.



Here is the gauges separated from the bezel.



Here they are installed daytime





Night time/low light shots