4JX1 to 4JX2 engine swap

Hi, has anyone put a 4JX2 3.1 turbo diesel engine in a Jackaroo with a current 4JX1 turbo diesel engine. I know there is mention of swapping to the 2.8 turbo diesel but the 3.1 seams a better option.
Not sure if/what 3.0 common rail would fit. Do you know if there is an 3.0 c/r engine that will bolt up?
I have been told that the 3.1 and 2.8 turbo diesel will bolt up and be a better engine overall. With the 2.8TD 4jb1-t being the easiest, most economical and better performer.
More than happy to take advice....