You could try several Scotty's that might be similar to your 2ball - Kombi, Detour, Red X, Futura.  The good thing is that you can usually find them used either on ebay or thecameroncollector.com for pretty cheap.  I would go roll as many as possible before searching out one to buy. 

There is no easy answer.  It depends on the length of the shaft, is it a twoballblade, what insert you have?  In addition, putting is such an individual m atter, you could get a putter that statistically is the same as the twoball and find that it feels much different.

The best solution is,  try to find a golf pro or golf store that has a variety of Scotty demo putters.  Generally, if you leave a deposit they will let you use the putter for a week.

You should always get fit for a putter, and then decide which Scotty is best for you.

Some Scotty putters that you may want to check out are the Kombi, Red X, Futura, Futura Phantom(s), Detour, etc.. You can always check out: http://www.scottycameron.com/putters/archive.aspx to learn more about them and his other creations. Sometimes, your local authorized Titleist rep, or online authorized Titleist sites, will offer the older models at a great price! Hopefully, you'll find exactly what you're looking for.

Scotty Cameron makes the best putter, but for economical reasons, I play another brand. They are great putters and are only $100 - $130. I'm trying to save up for a Scotty Cameron.

Hopefully I can get a Scotty one day. Great putters but, out my my price range for now.