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BabClayton
Since: Apr, 2016
2020-10-11 18:43:04
I have a couple of potential suggestions.
Author Catchphrase, Creator Thumbprint, Recycled Script, Signature Style, or Suspiciously Similar Song?
Are any of these the one, you're thinking of?
FishiousRend
Since: Jul, 2020
Chabal2
Since: Jan, 2010
jormis29
Since: Mar, 2012
iwantedtoaddsomething
Since: Feb, 2015

E.g. "Down In It" by Nine Inch Nails contains some reshuffled, pitch-shifted material from "Mechanical Movements" by Keith LeBlanc (released earlier in the same year), who was a producer on Down In It and its associated album.
Thinking mostly music but this could be for any medium - Robby the Robot would probably count.
Edited by iwantedtoaddsomething