They are not the same. Listen to them side by side... they sound totally different. I know for a fact that the Floyd never "sampled" their own work. A great deal of time was spent creating the sound effects and musical flourishes on The Wall.

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what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain