Margolie’s and Lavelle’s ballroom version is often fast paced and involves more energy.
The beats are incredibly steady as well (“History of the Cha-Cha”).
The Cuban form of the Cha Cha is often more sensual in nature.
The rhythm can also be more complex than just a steady beat.
Some Silver Patterns add Rhythm Variations and Syncopations, as well as more open types of dance positions.
Social Dance Music at the Silver Level can be Faster, Slower or More Creative than the Medium/Slow tempo Bronze Level.
Looking at the Song List to the Right "The Healer" Would be a good choice for Bronze Level, Whereas "Cha Cha Cha" would be more Silver Level Music.