Not sure why the price difference.
The 454-298 is made for use with your original turn signal control & horn button.
The 454-296 is made for an aftermarket horn push & will not work with your original turn signal/horn combination.
As a point of interest, none of the Moss wood rim steering wheels have the correct 120 degree spoke spacing of the original AH wheels. There are other sources of wheels that DO have the correct spoke spacing.
If this is important to you, I would check around a bit. Victoria British has the "Derrington" wheel, by Moto-Lita, with the correct spoke spacing & hub for your original horn/signal parts. Considerably more expensive though.
Others may have cheaper sources for the 120 degree wheel & adapter.
D