[davidw]

The style itself is changing; the results themselves are a direct result of your pub code. They aren't part of your style but are actually in an iframe. That information is derived from google and the display is generated by the pub code. As far as I know you can only have one variant of the pub code - the most current one.

It might be possible to "trick" Google, by using several different pub codes by going to google.com/adsense and getting all the different variations that you want and then using those, but two things you have to think of...
1) This is displaying in an iframe so an iframe's results are going to be independent regardless of what style you are using and which condition applies
2) That it could be against Google's ToS.

While an if condition (if style = x) might work, there is no guarantee.