Different meanings and different sources.
1. Different meanings. The spotlight refers to a person or thing that is coveted under the bright lights, and the sweet potato refers to a very popular thing or person, which is described as being very popular and sought after.
2. The sources are different. The spotlight comes from the spotlight on the stage. The focus on the stage is focused on a certain actor or prop, while other parts are weakened or ignored. The sweet and savory comes from China. food culture.