How do I match frame in imovie

One way is to select the clip in the timeline by clicking on it. Then do a File/Reveal in Project Media.

Another way is to select your library name in the project sidebar and, in the search box just above the media browser (the one with the Q in it), type in the name of your clip.

-- Rich

I’m not clear as to what you mean by “match”. It would help if you could you describe in more detail what you are trying to.

Are you asking how to copy a frame?

— Rich