In my search I found this and it has made my choice easy now. It seems that the different variations are only for colour, termination and accessories.
Variations Available:
* MKE2-3-ew Gold - Omni lav, beige, reduced sensitivity, with evolution wireless connector, includes MZQ222-NI clip and MZW2-g windscreen
* MKE2-4-3C Gold - Omni lav, beige, reduced sensitivity, with 3 pin LEMO plug for 3000 & 5000 Series, no accessories
* MKE2-4-3K Gold - Omni lav, beige, reduced sensitivity, with 3 pin LEMO plug for 3000 & 5000 Series with MZ2 accessory kit
* MKE2-4-C Gold - Omni lav, black, reduced sensitivity, with 3 pin LEMO plug for 3000 & 5000 Series, no accessories
* MKE2-4-K Gold - Omni lav, black, reduced sensitivity, with 3 pin LEMO plug for 3000 & 5000 Series with with MZ2 accessory kit
* MKE2-5-3C Gold - Omni lav, beige, reduced sensitivity, pigtails, no accessories
* MKE2-5-3-K Gold - Omni lav, beige, reduced sensitivity, pigtails, with MZ2 accessory kit
# MKE2-5-C Gold - Omni lav, black, reduced sensitivity, pigtails, no accessories
# MKE2-5-K Gold - Omni lav, black, reduced sensitivity, pigtails, with MZ2 accessory kit
# MKE2-60 Gold - Omnidirectional reduced sensitivity lavalier for K6, black with integrated K6 collar
# MKE2-ew Gold - Omni lav, black, reduced sensitivity, with evolution wireless connector, includes MZQ222 clip and MZW2 windscreen