The 466 deep fin is 9500. The shoal draft is 9680. 6’6” versus 5’6”. I just know mine is a bit tender and shallower lighter will not improve things.
If you are correct, then Sailboatdata.com has it backwards. It didn't make sense to me for the shoal draft to have less ballast than the fin keel, usually it is the other way around.
Ballast is only part of the stability equation, keel depth, hull form, and weight aloft are also part of the equation. With hull form probably the most significant for initial stability.