How to improve layer edges after applying generative fill AI ?

Hi everyone, I have been struggling with editing this image. I shot this image that has wrinkles on the background, then applied the generative fill in Photoshop. However, I notice that the edges of the image are not smooth (has artifacts/jagged), and the chair looks a tiny bit different from the original one (especially on the corners). I have the layer of the original chair. Is there a way somehow I place the "good" chair on top of the chair layer that has artifacts on the edge? How would you do about something like this? Thank you so much for your help.