Yes there is a huge difference between those two. Plus the judge wheel is wider as well.
Now as far as the judge wheel on the boardwalk.... Ew. But that's just my opinion.
The Boardwalk is a chrome'd out scoot. I wouldn't consider Judge wheels unless I had them chromed.. Now THAT might be pretty cool.
Still the Judge wheel doesn't so much fit in with the classic look the BW is going for. In a nice chrome finish a guy might get away with it and look pretty killer.
.. 2 cents given
2013 Hard-Ball - Lloydz VM1-DR cams, air filter, timing wheel, PCV, properly tuned at KMC
Master, Biltmore Lodge #446, AF&AM