Trust Milton Babbitt to spot that! BUT, are they exactly the same pitches taking into account at which register (or octave) they appear? I'd be disappointed at Babbitt if not!
And it's probably coincidental anyway, as you'd expect there to be more tonic than dominant and mediant pitches at the beginning of a tonal symphony, in this case 4 tonics versus 2 each of the other. The same wouldn't necessarily be true of a melody.



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(After all, the melody all lies within the compass of a major sixth, whilst the chords span four octaves.) 