This was taken from Big cheese Rodents:
Hopper Mice: Individual Weight(g):7.0 - 12.0
Adult Mouse: Individual Weight(g):19 - 29
So to answer your question, no, it wouldn't be more than the weight of an adult. Winston, my BP won't eat rats no matter how hard I've tried to switch him but he's a friggin torpedo when it comes to mice. I had extra hoppers so I would double feed him those. I spaced out the feedings even though he was eating them like they were breath mints. The other option is if you have any local reptile groups in your area, you can offer them to someone so they don't go to waste.