A ‘ziplink’ is not a type of link. are you referring to text links? That is, links within the $Text of a note. In Tinderbox the term ‘ziplinks’ refers simply to one of the methods by which a text link can be created.
The short answer is no, there is no one-click method to do this as Tinderbox is, as the the mode these days a single-window app. That said, you can open a selected note as a stand-alone secondary window via View menu → Text Window (⌘+⌥+X). However, that opens the current note. But, if you show the link pane for the current note (⌘+7) and click on the link to the you wish to open separately, a pop-up window appears showing the link’s target note in a pop-over. Click and drag-that to form a stand alone window. Not that if you click a link in a stand-alone window the main window’s focus moves to the target; the stand-alone window retains its focus.