After doing a little digging. Key work being little. Wiki was the only place that had an answer for me.
Originally Posted by Wiki
In addition to refining and balancing the existing character roster from the previous installments, Super Street Fighter II also introduced four new characters
So it balanced existing characters? Couldnt this be done with a patch? I understand that at the time 2 was around you couldnt patch arcade cabinets. Im talking here and now with 4. If the difference between regular and super are the same as it was with 2.