Hello Hinata47D, greetings and welcome to the Narutopedia! Thanks for your edit to the Sharingan page.
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As long as Vic Mignonga voices child Obito and Madara in Storm Impact, there's no need to add any tilde because this voice actor voices two different characters. If you look in the Japanese voice actors, you could find that Sōsuke voiced child Obito in Kakashi Gaiden and he's replaced by Megumi in the later episode and this is why we need to add that tilde. For your case, it doesn't needed. Thanks so much for your co-operation. —Shakhmoot