Do clan members ever get matched against each other in standard Arena battles?

When playing a standard arena battle in Clash Royale (not a "friendly" or "tournament" battle), is it possible (however remotely) for two members of the exact same clan to end up being matched together to battle each other?

Follow-up question: same question as above, but for a "challenge" battle.

Ladder: I would say no, as the wintraders back in the day made different clans to fight their own accounts (all the nova clans and all that). If one could battle their clanmates, this probably would not have happened.

Challenges: We don't know either. The link I posted was removed after I read it over and realized they were in different clans.