Yes, I have an old style one from an 82 300SD and a new style from a 84 300SD (have not seen a 300D at the junk yard yet). As you said the housings have the same part number.
What surprised me was that the older style bolt has a skinny smaller 12mm OD section the extends about 23mm beyond the threaded end. I think it would have been nice if Mercedes had retained that section on the newer bolt as it is less likely to pull in air as the fuel would be drawn from close to the middle of the filter instead of at the top.
