Can muscle attachment surgery in the upper lip make a difference in functionality and appearance?

I am a male in my 50's and I have had surgeries to repair my cleft lip and palate issues, but, in regards to my upper lip, there is at least some muscle missing in my upper lip. My question is: Can any amount of missing muscle in the upper lip cause it to have a different appearance than it should have? And, can the missing muscle have an effect on the functionality of the upper lip? (such as puckering to kiss someone, or to form words when speaking). I'd appreciate any help.