Note: Star Wars was not original either. All of its elements were taken from earlier science fiction work.
Star Wars Battle Droids versus Cylon Centurions
Both had rotating guns as part of their hand/wrists.
Clone Army Versus Cylon Skin Jobs
Seemingly Good Jedi Would go to the Dark Side versus Trusted People Were Really Cylon Skin Jobs
Anakin was a trusted Jedi. Count Dooku was trusted at one time before the movies, but in the arc of the characters. Senator Palpatine was trusted by the characters.
In the beginning of Battlestar Galactica, no one suspected any of the humanoid cylons and in the first season no one knew who could be a cylon. It also was not known which humanoid cylons were good or bad.
Luke I am Your Father Versus Final Five Mothers and Fathers to All Humanoid Cylons
A Long Time ago in Galaxy far away...Star Wars.
Long Ago (150,000 years) but not in another galaxy Battlestar Galactica.