In fact, yes, it's definitely a Futura rather than a Twentieth Century: the TCs both have a Q whose tail doesn't go below the baseline, whereas this font's does. On the other hand, it's not the Futura you link to there either, because that one has a J which goes below the baseline, and this font doesn't. So it looks to be either Futura (BT) or Futura Serie BQ. I can't see any clear points of distinction between those two, but on the basis of general weight I'd guess it's the former.

I can see some differences in those examples: the acute, grave, and circumflex accents have horizontal ends in the Bitstream version, but perpendicular ones in the Berthold version. This may not be of much help.

I'll keep an eye out for any accents that might crop up in the text, but I don't remember having seen any so far, so it may not help. Still, it's not terribly important.