If the big discrepancy is the fact that Outcry has a repeating chorus while Metropolis does not, then the same thing applies to OTBOA and PMU. PMU has a chorus A and a chorus B, and the final chorus plays one after the other, while OTBOA only has one chorus. This does not change the fact that they are otherwise structurally similar. With Outcry and Metropolis, the most important parts are the dual verses, the second of which is clean, and the single verse between the sole "chorus" and the instrumental section. I cannot think of a single DT song other than these two that shares this structure. And even then, it does not change the fact that both kick ass, though to degrees that vary from the common opinion on here.
Honestly, the only real similarity between PMU and OTBOA that I hear is the overall tone of the song. They're both heavy, but not aggressive, and were the first on their albums, and lead singles. You're right, structurally they're not the same. And even the instrumental breakdown in the two is vastly different.
It's not even that Metropolis doesn't have a repeating chorus, it's that it doesn't have a repeating rhythmic or melodic passage at all. Even the "verses" on it all have vastly different structures and melodies from one another.
Whereas on Outrcy, not only is there a repeating chorus, but there are verses that share the same melodic theme, such as "the rebel in us all...the cost us buried in the ground" verse has an identical structure to "the streets are bathed in blood...though you may stand upon my grave" verse. So if you want to break down the structure of Outcry it's like this:
Intro>Verse A>Verse B>Verse C>Chorus>Verse A>Verse C>Instrumental>Bridge>Chorus>Chorus>Outro Verse
With Metropolis, I honestly can't describe it in any other way than this:
Intro>Verse A>Verse B>Verse C>Instrumental>Outro Verse
And usually, I don't even bother breaking down the beginning of Metropolis into Verse A B and C, really, it's all one long verse to me.