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Voice acting, it’s not uncommon for multiple people to voice a character throughout the life of the character.
https://www.theverge.com/23919126/rick-and-morty-voice-actors-ian-cardoni-harry-belden
There are like a million people who can do a pretty good Rick voice, and half of them can also do a pretty good Morty voice, and a few of them are voice actors.
(Though it looks like there are two different voice actors for them now.)