Kefka Palazzo was created in 1994.
No, I don't think they would.
Considering that Kefka became a God, and the Joker is just a normal (yet insane) human, Kefka should pretty easily win. Good question though as they are both crazy clowns. Kefka also managed to destroy an entire world to ascend to godhood. Joker is probably a more interesting character though.
Palazzo dell'Antella was created in 1620.
Palazzo Barberini was created in 1633.
Palazzo Magnani was created in 1577.
Palazzo Ajutamicristo was created in 1501.
Palazzo Corsini was created in 1740.
Palazzo Isnello was created in 1780.
Palazzo Pitti was created in 1458.
Palazzo Rinaldi was created in 1822.
Palazzo Baldassini was created in 1519.
Palazzo Mezzanotte was created in 1932.