While it's pretty obvious that there's no direct analogy, it seems that there are plenty of parallels between Darth Vader's mechanical hand and Wormtail's artifical silver hand given by Voldemort:
Both lost their original hand in service of their Master (Anakin's was lost officially serving the Republic, but he was unbeknownst acting in Palpatine's interests when fighting Dooku. And then he lost the hand again fighting Obi-Wan Kenobi, this time directly on Emperor's behalf).
Both were rewarded by their Master with an artificial limb
For both, the limb had negative consequences - Wormtail was killded by his, and Vader merely lost part of his powers (as discussed elsewhere on this site) due to reduced Midichlorian counts AND reduced lightsaber fight dexterity.
Question: Is there any confirmation from JKR herself whether this was in any way, shape or form an intentional parallel or at least some influence? Or merely a set of coincidences from using a plot element that was similar?
I'm not looking for guesses, only JKR info.