Hanging from the bottom of the second box would indicate swarm cells. They say that cells up on the frame are supercedure. Also there is a certain number. I can't remember but a writer claimed that something like 5 or less could indicate supercedure and more swarm. Position I think is more reliable.Is there any physical difference. Is there somehow I can tell. This is my second year and Ive got what I think are queen cells hanging from the bottom center of my top hive box.....
Sounds like a swarm to me anyway.
Are they capped - probably not if the queen is still there? If so then it will be almost impossible to try to somehow stop the swarm. So best to split it. That is a lot easier than trying to catch a swarm (believe me).
The idea is to make the hive think the queen and the swarm have left.
I would have to look it over again - I've only made one split before... And there are different ways to do it. I will let others with more experience describe the process.
But no there is no physical difference between swarm and superceder.. for emergency cells there may be.