the numbers do not come back as good in my epc either, when he says TD one would assume diesel wagon, but the rear muffler is definately not from a wagon, i think his T in TD is reffering to the T in Turbo instead of the T in touring.
physically the parts look the same and would probably fit a gas model, but
i believe it is the internals or pipe diameter that is different, i would not risk buying theses for your 300E.

also after doing a parts comparison by current mercedes part numbers they do appear different.

Diesel:
center muffler part # 124-491-02-00
raer muffler part # 124-491-92-01

Gas:
center muffler part # 124-491-11-01
Rear muffler part # 124-491-04-00