How can I make these semi-gloss paint patches blend with the wall?
Since you have the original paint and it appears to be good, I would get a roller and work the entire area with a 2nd coat, I would work from the patches out so the roller is not putting as much paint out towards the edges this will help to fade the change in new to old and the second coat should cover the patches to not be noticable, with this said you may always be able to see the patch because you know where the repair was. But some one else may not be able to see the spots.