Different exercises for the same muscle groups do work muscles differently, but not in the hyper specific way that people think it’ll tighten, lift, or radically create muscle growth. Variety in exercises to make sure the entire muscle group is strengthened can be incorporated into workout routines, but more variety doesn’t mean better/more gains. If you have a good program with a little bit of variety, it’s more important to focus on consistency and adding weight over time, rather than worry about tweaking exercises.