Total Commander: Duplicate current path of the panel in the other panel
Solution 1:
Ctrl + → or Ctrl + ←, depending on direction.
Solution 2:
Another answer: Set the panel to the drive letter that the panel you want to copy is on. In switching to the drive it will get the directory. Note that this works even if you're already on the drive.
Solution 3:
Either click Commands>Target=Source or add a button to the toolbar with the cm_MatchSrc command.