Do You mean "Shot Match to This Clip"?
It's still here, at least on Mac, DR20 beta 3.

- shot match.png (577.57 KiB) Viewed 1079 times
Are you maybe right-clicking by mistake on only one selected clip? If so, then the option will not show. Select more then one clip then try again, or if only one clip is selected then right-click on any other clip.
It will also not show if you are on timeline node editor, switch to clip node editor.