I hope to don't make a mistake but if I remember well your styles must be SFF1 (important)
If the style have 4 variations your keyboard will read only 2: A and B
If you want to don't loose something (or the style is too big, like KB) you can go in Style Works and make from one style with 4 variation, 2 style with 2 Var.
Also SFF2 can be made SFF1 so you are able to have almost all styles from Yamaha.
Regards
Mihai