The system you are inquiring about is grouped in an area called EA/CC/ISC. Electronic accelerator/cruise control/idle speed control. You would not have EA without ASR but just having ASR doesn't guarantee having EA.
The easiest way to tell is to scan the system. It could be done by reading the vehicle data card and converting the version codes. Your dealer should be able to give you the data card.
Bosch Master, ASE Master, L1
33 years MB technician