Since you said we're using the stronger Joe, I'm assuming we're using Wii Joe
Joe downscales from, wait for it, 599,300 J/599.3 KJ (Joe downscales from Mac who either scales or downscales from Sandman. The ~115,000J is from Don Flamenco's calc, which is way lower). Meanwhile, Velma is at 45,089 J/45.089 KJ.
This is an approximately 13.2915x AP/Durability/SS gap in favour of Joe, though you could probably argue it down to just 13x or somewhat lower cause he's not that strong.
He also holds a massive stamina advantage, less character flaws, better equipment (his is standard while Velma doesn't have her hockey stick (not that it would change much) and relative, if not better skill.
Velma's only real advantage is her wrestling skills combined with an LS advantage, but that won't save her in this fight.
Now, I don't know if this is a stomp or not, but Joe absolutely wins this. If it is a stomp, changing him into the weaker version would make this closer to a mid diff win for Joe (imo), as he would lose his AP advantage. I'm not sure giving Velma her hockey would mean much, but you could do that too.