The answer to all of those is "yes". The problem is you haven't really asked a question, because we don't know what you want a ball to do. I mean if you have a 10 ball arsenal then having multiples of the same ball can be a good thing, more often than not though if you're bowling on house china similar drillings on the same ball with slight surface variations end up being pretty similar. Again need to know more about what you want in the end compared to what you have now?
Little known fact: In Russian "Hope" and "Change" translate to "Tax" and "Spend"