Are they the same person, or is it coincidental?

There’s a guy I know on another social media platform that goes by a nickname like; ‘Brave Dan.’ I knew him offline. Recently I asked a question on the platform about how to better understand non verbal communication. Then shortly after, a guy going by a nickname like ‘Brave Guy;’ added me to social media. These guys are both Autistic, both articulate. But those could be coincidences. I’m wondering, what are the odds that it’s the same guy, when they use the same platform and have similar and less common nicknames?

Are they the same person, or is it coincidental?
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