I don’t think those themes are too similar, sorry. The Mary’s death theme was part of the music set that was introduced when CC came out of his coma. I think they are by Dominic Messinger, but of course I’m not sure.
This library album was released in 1994, so apparently Mr. Ender reused some of his older music later on.
Thanks so much for this link! Now I'm aware that he's dead. But I think we need to check more music libraries where can be found his themes from SB.