There can be, because the bees now have more space to defend from robbers and pests, and to keep warm. I wrote this post earlier today in response to a different question, but it covers what you just asked in some detail:
I have actually been adding new brood boxes below the existing box this year, to help the bees with maintaining heat. It seems to working out very nicely, and I would do it again when I have a new hive. Of course with the Flow hive, you wouldn’t put the super under the brood - we are just talking about when you are expanding the brood area.