It will be a little more noticeable. My first one looked great. My second one just a little longer and little darker but not bad at all. I was very happy. I wouldn't worry. Anymore, they do a wonderful job.
Mine looked better after the second, that might be because they made such a mess the 1st time that the new consultant took pity on me and tidied it all up. X
I had had abdominal surgery for an appendicile abscess, and what they did for the C section was to use the same site and cut away all the old scar tissue (if you think of it, it's like a line in your skin, they simply went there and excised all the old scar line.) It looked about the same after the C-section, though my first scar was a little shorter because a baby had not needed to come out of it.