The Mercedes part number appears on most parts so use this, the parts are cheaper. Mercedes parts starting with the number 193 were specifically made for the Crossfire, they could show up on other Mercedes models at some time. Likewise the Crossfire uses parts from other Mercedes models as can be seen by the first three numbers of the part number.
Basically never use the Chrysler part number, if you were to buy the parts from Chrysler they would source the part from a Mercedes dealer and mark it up by a considerable amount just for putting their part number label over the Mercedes part number label.