This works for me in Premiere. Perhaps you have your shortcut keys set differently than I. If you go to your Premiere Pro menu and select “Keyboard Shortcuts”, in the search bar type in Match Frame. I have my Match frame set to “F” so when I select a clip on the timeline and hit F, it brings up the parent clip in source window. You can also change the shortcuts to be whatever you want. (If one is already set press the X next to the key and then double click it to set your own)
Is that what you were looking for?