Everyone should take the time to get to know the program they are using. What key to press should never be answered on the COW, sorry if that sounds harsh, it is not meant to be but there has to be a certain level of responsibility of each editor. The is a manual built into all the apple apps these days, a quick search of match frame would yield the answer.
But one thing that may not be straight forward is the match frame of the out point. When you go the next edit point you will need to go back one frame and then do the match frame. This will give you the out point. FCP out marker always includes the frame to the right of the marker.