I am of the opinion as well that the rear suspensions are identical. I threw a differential from an 83 300D and axles from the same car into my 115 without incident. It was actually much easier to do because of the pop out plastic covers in the trunk on the 115, giving you above access to the diff nuts. What a great idea.

On the front, the suspension is completely different, BUT, I actually think it looks more modern personally.

__________________
This post brought to you by Carl's Jr.