I've noticed this happening a few times: A challenge that is very similar to an existing code golf challenge is posted as a popularity contest, or the other way around. There seems to be very little consensus as to what to do in this situation.
Answers from a code golf challenge typically cannot be posted to a popularity contest (and vice versa). On the other hand, the challenges are very close and sometimes almost exact duplicates except for the winning criterion.
What should we do about these?