Rectify smooth filler patches on sand and cement skimmed wall
Welcome to the fun world of texture (intentional or not). This is why I dislike textured ceilings. Matching both the texture and color proves to be difficult, if not impossible.

While color is not an issue (this is new work), the texture is going to be a problem. There's no easy way to put a matching texture back on the smooth spots. What I would recommend is sanding it all smooth. Get a rubbing brick and work the wall until the texture change isn't noticeable anymore.

One other piece of advice: get a final opinion (after sanding) from someone not familiar with this. If a person seeing it for the first time can't notice, most people won't. Don't be too anal about the wall. Yes, you will know where you created smooth spots, but the average person doesn't scrutinize walls for flaws.