Much easier way: Open page in Checklinks. Hide all non red entries. Click "(info)".  A window will pop open with Wayback Machine results, the one in bold is the closest to the access date.  If it is within something like two week it will automatically select that revision, otherwise you'll need to click "Use" (the corner will turn green).  When done click "Save changes", a window will pop open with the diff, click "Save page".  —