The MH3 microphone has an electret element to capture the natural voice yet is light weight and small enough to fit into a portable 'go bag' or backpack.
A: Yes, it can. You will likely need to rewire the plug or build an adapter cable to do so. Remember that the MH3 uses an electret element so, therefore, will need to have a bias voltage applied to the mic elements. Most radios today can supply this internally with a menu setting.
A: Yes. Both radios were both designed to support the MH3's features.