At some degree the dents on the ROTJ are in the same positions to the ESB one, as the abdominal plate is the repainted ESB Hero, while the cod and collar armor is the reused Pre-Pro #3 (which was very close in paint scheme and dent placements to the ESB Hero). The chest plates are the reused Promo #1 plates (or the Heilman setup), but the left chest plate was dented to look like the ESB Hero one, while the right chest plate has a dent that is not present on the twin armors (Pre-Pro #1, Pre-Pro #3 and ESB Hero). The knees might be part of one of the twin armors, but the shoulder bells are dented differently. More info here ==>
The Fate Of The Twin Armors: Pre-Pro #1, Pre-Pro #3 and ESB.