Under the assumption that they both have none of their Optional Equipment, there's a little bit of an obstacle. (Besides that Spongebob's miniscule size of like what, 4 inches?)
Mickey has Mid Regeneration, Spongebob has Mid-High Regeneration.
So neither can really put down the other. Though Mickey might have an edge if it's just a matter of exhausting their Stamina, since his size means he has much better range to hit Spongebob more often.
But if it doesn't come down to a contest of Stamina....
Broadway Force (
Managed to get an entire forest of aggravated animals to dance along with him),
Animal Manipulation
It MIGHT work on Spongebob, given it's Broadway Force, but Spongebob has Mind Manipulation resistance feats, albeit, all related to resisting Plankton's trick, as opposed to not being persuaded to dance or such.
If Mickey had his Optional Equipment, THIS might be notable:
Telekinesis,
Transmutation,
Teleportation,
Water Manipulation,
Size Manipulation and
Transformation (In case the magic wand is snapped, it'll transform itself into a creature able to fight back)
with the Magic Wand
But I'm not sure how all of those work. Transmutation & Teleportation might be theoretically useful.
There's also the possibility that Mickey's chemistry knowledge might be able to make him think up some kind of formula to incapacitate or destroy the relatively tiny sea sponge.... But it's questionable that he has the equipment to do so, & it's unsure if he'd think to do so to begin with.
How do their AP & Durability match up?
In terms of Speed, Mickey scales to outrunning an enraged lion, citing the Lion (Real World) profile, which lists a speed of:
Speed: Superhuman (Can run up to 80.5 km/h, 22.36 m/s or 50mph)
Spongebob has:
Speed: Athletic Human (
Can outrun Sandy Cheeks), possibly
Superhuman (
Caught a flying pelican fast enough to pluck a feather from it).
Unsure how fast that is, though.