CT-20 vs. CT-20B vs. CT-26

[metal masher]

Hello, I noticed that a number MR2 people have been swapping their stock CT-26 for a CT-20B.

A) What are the main benefits (and/or drwbacks) of this swap?

B) What are the main differences between a CT-20B and a CT-20 like that from a 22R-TE engine?

C) How do these turbos compare to the dynamics of a Garret T25, T28 & T3?

D) Would any of you have any blow-up diagrams of the internals of a CT-20 that you could forward to me?

I'm sorry about the multiple questions, but they are somewhat interrelated. I have an '85 Toyota turbodiesel pickup which came with a CT-20 (which is beyond repair). I am thinking about adapting a T25 or T28 or a T3 because they seem easier to come by and less prone to cracking at the exhaust housing.

Also I have a friend who is tying to rebuild a CT-20 from a 22R-TE engine and he is looking for schematics.

[metal masher]