Nice pick-up Gary. The last two baseball players [Smith and Kelly] were ones that I knew were out there because I have cuts of both. It should complete the known ballplayers because the same art was issued in ten-card strips, at least for the boxing:
And there are known baseball strips too:
The only way to tell them apart accurately is to hold them in hand and compare them--the strips are thinner and slicker than the Exhibits.
As for the interplay of movie and sports, there are cards known with baseball and boxing, baseball and movies, boxing and movies, and movies only.
I don't think it is possible to exhaustively catalog every combo. I have scans of several different movie-only cards that I will have to dig out and post.