> Don't ever let a poet see this comment

Why?

My guess is that sixty-seven has four syllables, twenty-five has three.

In the first verse, there doesn't seem to be any pattern to the lengths (in syllables) of the lines; 10, 7, 8, 8, 12, 8. I'm not sure the meter would really be damaged that much by reducing the last line by one syllable.

Sixty-seven has a completely different feeling than twenty-five.

It's likely less about meter than flow.

they don't sound the same.