If you convert a style it will always have the same numbers of bars as before, but it will sound different because each keyboard has different instruments (like drums, basses, guitars and so on); Solton keyboards use a lot of guitars in their 8 and 16 beat styles probably because they have a good acoustic guitar sound, but on a Yamaha keyboard you will have to adjust the guitar track to match the Yamaha guitar sound. The most beautiful style are those programmed by great musicians with a lot of taste, but they are usually expensive to hire; styles which last 4 or 8 bars are usually better than those lasting 2 bars because are less repetitive, just like a real rhytm section, but they use much more internal memory.
I hope that this reply was satisfying to you.