Opening a PWA from another PWA

I'm trying to workout a way to open another PWA from within a PWA.

  <a href="https://www.link.com">Admin</a>
  <a onclick="window.open('https://www.link.com', '_self'); return false;"> Admin</a>
  <a onclick="window.open('https://www.link.com', '_system'); return false;"> Admin</a>
  <a onclick="window.open('https://www.link.com', '_blank'); return false;"> Admin</a>

I've tried just opening the link as I would usually link to a website, with the thought that it would possibly open the PWA if it had already been added to the home screen, but it does not.

The first Two Takeover the current view, and don't provide a way to swap between the apps (outside of a similar link back to the first one). You can't swap between them like a normal app, or if you had opened them from the home screen.

The second two, open up web browsers with back and a url bar on ios, and close and no url bar android (shows the url but not allow it to be changed)

None of them work as I was hoping, whee it would open the PWA from home screen if that site was already added to home screen.