only if you don't mind the same 4 right hand setups for all styles - press and hold msa, switch to panel memory, the first 4 panel memories of bank A are recalled with the variation buttons. However these 4 right hand setups will appear for all styles unless you change the panel memories.

A more flexible route of avoiding normal panel memories for changing registrations - copy the style to the composer, put the registrations in the first four panel memories of the same bank, then copy the composer to custom. Now in msa mode you can change right hand registrations with the 4 variation buttons rather than using panel memories and have new setups for every style rather than the same one, all permanently in the keyboard - just like a fully user programmed preset in fact. While you are in composer you can change the sounds in each part of each variation independently, which offers more flexibility than the sound arranger which changes each part of each variation to the same voice.