I just got done doing all the little self tests in my engine dynamics and theory books. I feel like I know everything, but it seems that the pistons would differ because of the higher compression on the lower output motor and a lower on the bigger. Because if it was just rod length then you would want to think the opposite. Unless*** There is a huge possibility that the 2.3 head just has more cc's in each chamber than the 2.0 resuliting in a higher output, yet lower compression.
Just my .02 of what ive learned.