Eagles' "Saturday Night"

I'm listening to the Eagles' Desperado.  There's a song called "Saturday Night" that rhetorically asks, "Whatever happened to Saturday night?"  I didn't notice this the first time I listened to this album (this is only the second time I've listened to it), but that line is also a line in Buffalo Springfield's "Whatever Happened to Saturday Night?" (and, of course, the title).  Buffalo Springfield released only three albums (four, if you include Retrospective), but "Whatever Happened to Saturday Night?" didn't appear on any of them.  I'm not sure, but I think it was first released on Box Set.

In any case, I don't think it's likely that the Eagles knew about the Buffalo Springfield's "Whatever Happened to Saturday Night?"  Yet it's still interesting that the two bands - which are pretty similar in their musical styles - are asking the same question.