What are some examples of someone "stealing" someone else career? In other words, performers who shared conveniently similar qualities?

Bob Goldthwait was an unfunny Sam Kinison.

Kathy Griffin and Chelsea Handler and Amy Schumer and Sarah Silverman.

All equally unfunny and annoying. :(

Brittany Murphy's career took off after "Clueless." Alicia Silverstone's career tanked.