When two fictional characters have the same actors/voice actors: Twice.

Clarence Nash was the original voice of Donald Duck and his nephews. Donald's voice is now provided by Tony Anselmo. When not voiced by Russi Taylor, the nephews are also voiced by Tony Anselmo.
 
In south park, Mary Kay voiced most of the female characters until she died. Now several actresses voice them. Does that count?
 
Another one that came to mind after watching Batman The Brave and The Bold recently. Both Keith David and Kevin Michael Richardson voiced supervillains Despero and Tombstone.

Keith voiced Despero on the Justice League episode Hearts and Minds Part 1 and 2, while Kevin voiced him on the Batman The Brave and The Bold episode The Eyes of Despero.

Keith voiced Tombstone on the first episode of The Spectacular Spider-Man, with Kevin taking over voicework for the rest of Season 1 and then 2. Though Keith does reprise the role for the Gargoyles/Spider-Man Radio Play.
 
Four relevant anime examples:

In the older Troma/Fox dub of "My Neighbor Totoro", the younger sister Mei was voiced by Cheryl Chase (voice of Angelica Pickles on "Rugrats").
Chika Sakamoto, who voiced Mei in the Japanese version, voiced Angelica Pickles in the Japanese dub of "Rugrats".

In Viz's 1996 dub of "Galaxy Express 999", the main character Tetsuro Hoshino was voiced by Saffron Henderson (voice of young Goku/Gohan in the Ocean dubs of Dragon Ball/Dragon Ball Z).
Mazako Nozawa voiced Tetsuro in the original Japanese version and also voiced Goku and Gohan in Japanese Dragon Ball/Z.

Wendee Lee voices both the title character from "The Meloncholy of Haruhi Suzumiya" and Konata from "Lucky Star" in the English dubs. Aya Hirano voiced them in Japanese. There are other examples found in these two shows and were intentional by the dubbing company.

Kappei Yamaguchi voiced both boy Ranma of "Ranma 1/2" and Inu Yasha in Japanese. Richard Cox voiced boy Ranma in the later seasons of the English dub version and also voices dub Inu Yasha.
 
Here's one that hasn't been mentioned yet. Paul Winchell was the original voice of Tigger, up until Jim Cummings took over the role in the 90's. Likewise, Winchell was the voice of Zummi Gummi for the first few seasons of Adventures of the Gummi Bears, but for the final season Cummings provided Zummi's voice.
 
This isn't actually as uncommon as you might think. If a voice actor has a voice that's similar to another actor (or can make a fake voice that sounds similar), it's not unusual that one would be asked to fill in in the absence of the other on more than one occasion. Especially if one is much older than the other and retires long before the other.


The more rare cases would be those in which the actors sound completely different, and voice completely different versions of the same character, rather than the same version.
 
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