Both of these shots convey the idea that the person that we had viewed as morally sound has been trapped by their actions. Both are trapped in the areas where they have done their best work; for Neff it is his office at the insurance company and for Exley it's one of the rooms where he interrogated the original three Nite Owl Massacre subjects. This helps the viewer to see that both Exley and Neff have had their roles reversed, as Keyes now looks down on Neff for what he did to Mr. Dietrichson and Exley has gone from the interrogator to the interrogatee following the events at the Victory Motel concerning Captain Dudley Smith. In both frames, the "protagonist" is sitting down and the other figure(s) are standing, which shows that the "protagonist" has less power than they may have had before.
In the L.A. Confidential still, the reflections of the heads of the LAPD are on the window and appear as if they are sitting alongside Exley, which suggests that they are trapped by how to best cover up what happened. In the end, both movies conclude with the "protagonist" being helped out by the other side, although it is no stated to the viewer how Neff's situation is resolved.
