The diff may interchange with many other benz chassis. But be aware that there are several differences to consider, even within the same model. Is it an antslip rear? Does the car have anti lock brakes? What is the diameter of the input and output flanges?. You need to research these factors, or you will get half way through the conversion and face an unsurmountable problem. I really dont like tire swaps, its a crude approach. Tire swaps are likely to have profound effects on handling, load and traction. What usually happens with tires is that someone goes out and drops $2k on tires and rims, and reports amazing results. Nobody admits that they wasted $2k.

The other consideration is that dropping the revs by either a diff swap or fiddling with tires will screw up your speedometer calibration. Unlike something like a GM or Ford car, its very hard to find corrective speedometer drive gears. Your alternative would be to find a matching speedometer head, or installing a conversion box.

The least problematic way to address this is to find a five speed overdrive transmission. That will allow you to select an appropriate gear for any circumstance. The speedometer would work as normal without modification.