Yes, it should be possible.
If the model you're using has the Style Creator feature, I think you can copy the style you're interested in, view how each of the style channels are set up, and modify them as desired.
If the model you're using doesn't have the Style Creator feature, you can connect the keyboard to a computer, turn on the Style Out function, and use a MIDI monitor to see the MIDI messages that get output when you select the style-- these will be from the style's "SInit" section where the channels are set up.