Most of those all seem to share the same melody, just different versions, if I'm not mistaken. Are these original anime songs? To answer your question, the music is from Brotherhood, but I could swear some of it was in the original as well.
I didn't find it in the pack I listened to, unfortunately, but I watched episode 46 again, and it's the song that plays right around 8minutes when Ed and Winry are having a serious discussion.
In addition, if anyone knows the songs that play around 1:50~ and 5m~ I'd be really grateful for names or sources of those as well. D:
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