2nd preview pane w navigation lock?

I love the navigation lock for me as a photographer. It would be even better if I could have 2 preview panes: 1 to show the top lister window's selected image and then a 2nd preview pane to show the corresponding 2nd lister's (automatically) selected image? Does this functionality exist?

I ask because I need to compare 2 versions of the same image filename with before and after work.

The only current way to do that would be to have two separate windows, one for each folder.

(Something I do sometimes is load both images into a standalone viewer and then flip back and forth between them. At other times, I load them into a comparison tool which visually highlights different areas.)

Thanks for your quick replay as always Leo. What is the "comparison tool" you mentioned?

Beyond Compare is the tool.