The difference is hypothetical, because if enough people exit the active fund, even if the fund manager thinks it's a folly, eventually they have to sell whatever makes up the fund, and eventually those sells will push prices down. That's why crashes are fast and hard.

Yes in theory the manager can try to alter the composition of the fund by selling the stocks that are still going strong. But why would they? That just exposes them to known hazards even more.

So, probably the active funds will be the first ones to drop the small stocks first in a crash.