Will a 99 E430 Sport bumper fit on a 2000 E320?

[Bill '90 300E]

I have all of a sudden found myself with 2 W210s. One is a '99 E430 Sport that may become a parts car (I'll know more tomorrow). If so, I like the rear bumper on the Sport and would like to swap it over to a 2000 E320, but I'm unsure of the fitment after seeing several ebay listings that lead me to believe that the swap won't work. Does anyone know if it might be a direct swap or if it can be done with minimal manipulation...or it simply can't easily happen?