Yes, G box2 will work with KM100.
But KM100 does not have Mercedes and BMW immobilizer key programming capacity, so it will not do Benz DAS3 EIS/EZS all keys lost and DME/DDE ISN reading in boot/bench mode like IM508/IM608 does.
KM100 works with G-box2 and Toyota 8a AKL adapter to retrieve Toyota Immo data.
On KM100 has apb112 emulator built-in. KM100 seems a bit faster device, can simulate chip, it is same as im508 for immo but without programmer.